If you want to boost through LNBeats, yes you will need an Alby. However, once you find a musician you like and want to support, you can boost them from ANY Podcasting 2.0 app which opens the door for far more options:

https://podcastindex.org/apps

If you run a node, you can also boost the music feeds directly from it using the BoostCLI protocol which you can find on GitHub:

https://github.com/valcanobacon/BoostCLI