PYSimpleGUI for downloading MP3 files from YouTube based on a search, Spotify playlist URL, or all playlists under a Spotify username

1. Open Google Cloud Console: https://console.cloud.google.com/
2. Make a new project, call it whatever
3. Select this new project
4. Search for "YouTube Data API v3" and enable it
5. Search for "Credentials"
6. Create Credentials -> API key
7. Copy the key, replace line 23 with the key
8. Run

There is an upper limit of (30,000?) daily calls you can make on free keys