https://www.polygon.com/2018/6/6/17434666/guitar-hero-live-shutdown-song-library-activision

Guitar Hero Live’s streaming music service, Guitar Hero TV, will close down in December, effectively cutting the game’s accessible library to just 42 songs.

When it launched in October 2015, Guitar Hero TV eschewed paid downloadable content to expand the game’s song library, where songs were made free in a rotation, although some were also accessible through microtransactions. The trade-off is that the song catalog, which Ars Technica notes stands at 484, would only be available as long as Activision supported it. Apparently, the end of their licensing agreements comes in December, so out goes it all.