Is Go! Go! 575 hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2014 · 4 episodes · PG-13 - Teens 13 or older
Slice of Life
Go! Go! 575 adapts the Project 575 games for PlayStation Vita and iOS, which allow anyone to create songs using the traditional Japanese 5-7-5-syllable meter found in haiku and tanka poems. (Source: ANN)
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