TM REVOLUTION (I primarily have listened to TM REVOLUTION's Gundam theme songs) has got some really good stuff. Bump of Chicken (known by me for their Tales Of, SPY X FAMILY, and Pokemon contributions), angela (Soukyuu no Fafner) and L'Arc En Ciel (Gundam, and Beyblade) are other good ones, too. I mainly just listen to music when it's in anime or games, though, and far less often by itself.
