If it wasn’t on your phone, I would point to yt-dlp: simply type yt-dlp -F <Youtube URL>
to list the available formats, then yt-dsp -f <format ID> <Youtube URL>
to download the audio in the format of your choice:
E.g.:
$ yt-dlp -F https://youtu.be/xWUCsE4IM_c
[youtube] Extracting URL: https://youtu.be/xWUCsE4IM_c
[youtube] xWUCsE4IM_c: Downloading webpage
[youtube] xWUCsE4IM_c: Downloading ios player API JSON
[youtube] xWUCsE4IM_c: Downloading android player API JSON
[youtube] xWUCsE4IM_c: Downloading player 6e1dd460
WARNING: [youtube] xWUCsE4IM_c: Signature extraction failed: Some formats may be missing
[youtube] xWUCsE4IM_c: Downloading m3u8 information
[info] Available formats for xWUCsE4IM_c:
ID EXT RESOLUTION FPS CH │ FILESIZE TBR PROTO │ VCODEC VBR ACODEC ABR ASR MORE INFO
───────────────────────────────────────────────────────────────────────────────────────────────────────────────
sb2 mhtml 48x27 0 │ mhtml │ images storyboard
sb1 mhtml 80x45 0 │ mhtml │ images storyboard
sb0 mhtml 160x90 0 │ mhtml │ images storyboard
233 mp4 audio only │ m3u8 │ audio only unknown Default
234 mp4 audio only │ m3u8 │ audio only unknown Default
139 m4a audio only 2 │ 3.16MiB 49k https │ audio only mp4a.40.5 49k 22k low, m4a_dash
140 m4a audio only 2 │ 8.38MiB 129k https │ audio only mp4a.40.2 129k 44k medium, m4a_dash
269 mp4 256x144 25 │ ~ 11.11MiB 172k m3u8 │ avc1.4D400C 172k video only
160 mp4 256x144 25 │ 4.08MiB 63k https │ avc1.4D400C 63k video only 144p, mp4_dash
230 mp4 640x360 25 │ ~ 51.95MiB 803k m3u8 │ avc1.4D401E 803k video only
134 mp4 640x360 25 │ 13.88MiB 215k https │ avc1.4D401E 215k video only 360p, mp4_dash
605 mp4 640x360 25 │ ~ 37.67MiB 582k m3u8 │ vp09.00.21.08 582k video only
232 mp4 1280x720 25 │ ~166.26MiB 2569k m3u8 │ avc1.4D401F 2569k video only
136 mp4 1280x720 25 │ 52.13MiB 806k https │ avc1.4D401F 806k video only 720p, mp4_dash
270 mp4 1920x1080 25 │ ~306.16MiB 4730k m3u8 │ avc1.640028 4730k video only
137 mp4 1920x1080 25 │ 159.35MiB 2462k https │ avc1.640028 2462k video only 1080p, mp4_dash
$ yt-dlp -f 140 https://youtu.be/xWUCsE4IM_c
[youtube] Extracting URL: https://youtu.be/xWUCsE4IM_c
[youtube] xWUCsE4IM_c: Downloading webpage
[youtube] xWUCsE4IM_c: Downloading ios player API JSON
[youtube] xWUCsE4IM_c: Downloading android player API JSON
[youtube] xWUCsE4IM_c: Downloading player 6e1dd460
WARNING: [youtube] xWUCsE4IM_c: Signature extraction failed: Some formats may be missing
[youtube] xWUCsE4IM_c: Downloading m3u8 information
[info] xWUCsE4IM_c: Downloading 1 format(s): 140
I suggest renaming it the Gulf of How Does This Help Grocery Prices Again?