diff --git a/comfy_extras/nodes_audio.py b/comfy_extras/nodes_audio.py
index 57d0a20a..8efa7c0a 100644
--- a/comfy_extras/nodes_audio.py
+++ b/comfy_extras/nodes_audio.py
@@ -93,11 +93,18 @@ class SaveAudio:
         return { "ui": { "audio": results } }
 
 class LoadAudio:
+    SUPPORTED_FORMATS = ('.wav', '.mp3', '.ogg', '.flac', '.aiff', '.aif')
+
     @classmethod
     def INPUT_TYPES(s):
         input_dir = folder_paths.get_input_directory()
-        files = [f for f in os.listdir(input_dir) if os.path.isfile(os.path.join(input_dir, f))]
-        return {"required": {"audio": [sorted(files), ]}, }
+        files = [
+            f for f in os.listdir(input_dir)
+            if (os.path.isfile(os.path.join(input_dir, f))
+                and f.endswith(LoadAudio.SUPPORTED_FORMATS)
+            )
+        ]
+        return {"required": {"audio": (sorted(files), {"audio_upload": True})}}
 
     CATEGORY = "_for_testing/audio"
 
diff --git a/web/extensions/core/uploadAudio.js b/web/extensions/core/uploadAudio.js
new file mode 100644
index 00000000..d3dfef4a
--- /dev/null
+++ b/web/extensions/core/uploadAudio.js
@@ -0,0 +1,176 @@
+import { app } from "../../scripts/app.js"
+import { api } from "../../scripts/api.js"
+
+function splitFilePath(path) {
+  const folder_separator = path.lastIndexOf("/")
+  if (folder_separator === -1) {
+    return ["", path]
+  }
+  return [
+    path.substring(0, folder_separator),
+    path.substring(folder_separator + 1)
+  ]
+}
+
+function getResourceURL(subfolder, filename, type = "input") {
+  const params = [
+    "filename=" + encodeURIComponent(filename),
+    "type=" + type,
+    "subfolder=" + subfolder,
+    app.getPreviewFormatParam().substring(1),
+    app.getRandParam().substring(1)
+  ].join("&")
+
+  return `/view?${params}`
+}
+
+async function uploadFile(
+  audioWidget,
+  audioUIWidget,
+  file,
+  updateNode,
+  pasted = false
+) {
+  try {
+    // Wrap file in formdata so it includes filename
+    const body = new FormData()
+    body.append("image", file)
+    if (pasted) body.append("subfolder", "pasted")
+    const resp = await api.fetchApi("/upload/image", {
+      method: "POST",
+      body
+    })
+
+    if (resp.status === 200) {
+      const data = await resp.json()
+      // Add the file to the dropdown list and update the widget value
+      let path = data.name
+      if (data.subfolder) path = data.subfolder + "/" + path
+
+      if (!audioWidget.options.values.includes(path)) {
+        audioWidget.options.values.push(path)
+      }
+
+      if (updateNode) {
+        audioUIWidget.element.src = api.apiURL(
+          getResourceURL(...splitFilePath(path))
+        )
+        audioWidget.value = path
+      }
+    } else {
+      alert(resp.status + " - " + resp.statusText)
+    }
+  } catch (error) {
+    alert(error)
+  }
+}
+
+// AudioWidget MUST be registered first, as AUDIOUPLOAD depends on AUDIO_UI to be
+// present.
+app.registerExtension({
+  name: "Comfy.AudioWidget",
+  async beforeRegisterNodeDef(nodeType, nodeData) {
+    if (["LoadAudio", "SaveAudio"].includes(nodeType.comfyClass)) {
+      nodeData.input.required.audioUI = ["AUDIO_UI"]
+    }
+  },
+  getCustomWidgets() {
+    return {
+      AUDIO_UI(node, inputName) {
+        const audio = document.createElement("audio")
+        audio.controls = true
+        audio.classList.add("comfy-audio")
+        audio.setAttribute("name", "media")
+
+        const audioUIWidget = node.addDOMWidget(
+          inputName,
+          /* name=*/ "audioUI",
+          audio
+        )
+        // @ts-ignore
+        // TODO: Sort out the DOMWidget type.
+        audioUIWidget.serialize = false
+
+        const isOutputNode = node.constructor.nodeData.output_node
+        if (isOutputNode) {
+          // Hide the audio widget when there is no audio initially.
+          audioUIWidget.element.classList.add("empty-audio-widget")
+          // Populate the audio widget UI on node execution.
+          const onExecuted = node.onExecuted
+          node.onExecuted = function(message) {
+            onExecuted?.apply(this, arguments)
+            const audios = message.audio
+            if (!audios) return
+            const audio = audios[0]
+            audioUIWidget.element.src = api.apiURL(
+              getResourceURL(audio.subfolder, audio.filename, "output")
+            )
+            audioUIWidget.element.classList.remove("empty-audio-widget")
+          }
+        }
+        return { widget: audioUIWidget }
+      }
+    }
+  },
+  onNodeOutputsUpdated(nodeOutputs) {
+    for (const [nodeId, output] of Object.entries(nodeOutputs)) {
+      const node = app.graph.getNodeById(Number.parseInt(nodeId));
+      if ("audio" in output) {
+        const audioUIWidget = node.widgets.find((w) => w.name === "audioUI");
+        const audio = output.audio[0];
+        audioUIWidget.element.src = api.apiURL(getResourceURL(audio.subfolder, audio.filename, "output"));
+        audioUIWidget.element.classList.remove("empty-audio-widget");
+      }
+    }
+  },
+})
+
+app.registerExtension({
+  name: "Comfy.UploadAudio",
+  async beforeRegisterNodeDef(nodeType, nodeData) {
+    if (nodeData?.input?.required?.audio?.[1]?.audio_upload === true) {
+      nodeData.input.required.upload = ["AUDIOUPLOAD"]
+    }
+  },
+  getCustomWidgets() {
+    return {
+      AUDIOUPLOAD(node, inputName) {
+        // The widget that allows user to select file.
+        const audioWidget = node.widgets.find(w => w.name === "audio")
+        const audioUIWidget = node.widgets.find(w => w.name === "audioUI")
+
+        const onAudioWidgetUpdate = () => {
+          audioUIWidget.element.src = api.apiURL(
+            getResourceURL(...splitFilePath(audioWidget.value))
+          )
+        }
+        // Initially load default audio file to audioUIWidget.
+        onAudioWidgetUpdate()
+        audioWidget.callback = onAudioWidgetUpdate
+
+        const fileInput = document.createElement("input")
+        fileInput.type = "file"
+        fileInput.accept = "audio/*"
+        fileInput.style.display = "none"
+        fileInput.onchange = () => {
+          if (fileInput.files.length) {
+            uploadFile(audioWidget, audioUIWidget, fileInput.files[0], true)
+          }
+        }
+        // The widget to pop up the upload dialog.
+        const uploadWidget = node.addWidget(
+          "button",
+          inputName,
+          /* value=*/ "",
+          () => {
+            fileInput.click()
+          }
+        )
+        uploadWidget.label = "choose file to upload"
+        uploadWidget.serialize = false
+
+        return { widget: uploadWidget }
+      }
+    }
+  }
+})
diff --git a/web/scripts/app.js b/web/scripts/app.js
index a354ff80..5fc9b9c6 100644
--- a/web/scripts/app.js
+++ b/web/scripts/app.js
@@ -71,7 +71,7 @@ export class ComfyApp {
 		 * Stores the execution output data for each node
 		 * @type {Record<string, any>}
 		 */
-		this.nodeOutputs = {};
+		this._nodeOutputs = {};
 
 		/**
 		 * Stores the preview image data for each node
@@ -86,6 +86,15 @@ export class ComfyApp {
 		this.shiftDown = false;
 	}
 
+	get nodeOutputs() {
+		return this._nodeOutputs;
+	}
+
+	set nodeOutputs(value) {
+		this._nodeOutputs = value;
+		this.#invokeExtensions("onNodeOutputsUpdated", value);
+	}
+
 	getPreviewFormatParam() {
 		let preview_format = this.ui.settings.getSettingValue("Comfy.PreviewFormat");
 		if(preview_format)
diff --git a/web/style.css b/web/style.css
index 8091a489..e983b652 100644
--- a/web/style.css
+++ b/web/style.css
@@ -632,3 +632,7 @@ dialog::backdrop {
 		border-top: none;
 	}
 }
+
+audio.comfy-audio.empty-audio-widget {
+	display: none;
+}