lmao ma bad uchida aya is the VA for kotori! and nitta emi si the VA for honoka LOL woops o! and kubo yurika is the VA for hanayo. there u go AHAH i didnt know what exactly u were asking for in terms of whos singing but im p sure its easy to look up. if u want to know more just ask :)

omg i had a huge phase for muses at one point aha they have real good songs tbh but its a 9 member group. they have their own wiki like this is the link to their voice actresses http://love-live.wikia.com/wiki/Category:Love_Live!_Voice_Actress and i think u can also google like member profiles to see who voice acts which character. uhh but from my knowledge: Pile is the VA for Maki, Tokui Sora is the VA for Nico, Kusuda Aina is the VA for Nozomi, Iida Riho is the VA for Rin, Uchida Aya is the VA for Honoka, Nanjou Yoshino for Eli, Mimori Suzuko for Umi, and im missing like 2 i think for Hanayo and Umi.

Whenever I read/hear about Love Live, I can only think of Zakki (Shimazaki Nobunaga), lol. But to answer your question, I searched for it and found the artist to be μ (Muse). Here's some info about the song: http://love-live.wikia.com/wiki/Paradise_Live