Disclaimer: this program respects copyright¶

This program downloads the songs from YouTube with yt-dlp, a fork of youtube-dl. The latter is legal, see the reversal takedown notice.

The terms of use of the services are respected, as downloading music from YouTube is not illegal:

Deezer¶

III. DEVELOPER WARRANTY

Developer warrants and represents to DEEZER that he: [...]

6) Will not use the Services in any way or on any website that is associated or promotes in whatever manner the illegal or unauthorized use, streaming, download, or sharing of music and associated elements content, including but not limited to the Content provided by DEEZER.

iTunes¶

Your Use of the Site [...]

You may not use the Site or any Content for any purpose that is unlawful or prohibited by these Terms of Use, or to solicit the performance of any illegal activity or other activity which infringes the rights of Apple or others.

Spotify¶

Section IV. Restrictions [...]

2) General restrictions.

c) Illegal or unauthorized purpose. Do not use the Spotify Platform, Spotify Service or Spotify Content for any illegal or unauthorized purpose

Musixmatch¶

7.2 You shall NOT: [...]

7.2.2 use any illegal music streaming and/or download in combination with MusiXmatch Data;