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PURE Idol music in general is garbage. Overproduced shit with the same fucking combo: (piano and fiddle bg)+generic pop punk that loops after 1:30. The excessive voice layers make the songs unreplicable live. Vocalists are forced to sound all the same. It's one of the most boring music genres of all time but there's a public for it, so deal with it.
That being said, I don't think OP have listen to any holo songs ever. If not, he was aware of:
glory days - Roboco
Unison - Houshou Marine
Po - Omaru Polka
Kagetsu no Yume - Sakura Miko
Yoake no Mellow - Okami Mio
STAR START - Tokino Sora
SAIKYO TENSAI WONDERFUL WORLD of KORONE
MOGU MOGU YUMMY! - Nekomata Okayu