https://www.gamespot.com/articles/guitar-hero-live-losing-200-plus-songs/1100-6459387/

Activision resurrected the Guitar Hero franchise in 2015 with Guitar Hero Live, and one of the music game's most interesting new features was Guitar Hero TV. Some songs in the online mode feature full-motion video as you play as a band's lead guitarist in a first-person perspective. The better you perform, the more the crowd gets into it; miss a lot of notes and the crowd will start booing. It is weird and cool.

Activision announced in a forum post (via GI.biz) that Guitar Hero TV will close on December 1, with the servers shutting down. The mode features 200-plus songs that are exclusive to it, compared to 23 songs on the base game soundtrack, so losing Guitar Hero TV reduces the total number of playable songs significantly.