MuseGen (https://www.musegen.ai/) generates complete songs from a text instruction or provided lyrics.

Two interfaces: basic with simple and expert instruction with lyrics, style and choice of female or male voice.
Duration of the pieces of about 4 minutes.

A lyric generator is offered free of charge and without limits (https://www.musegen.ai/fr/lyrics-generator).

Note: downloading is not possible in the build interface but it is via the share link (see screenshots).

In the free version, 4 songs per day (2 generations: 2 songs per generation).