Zexal they started cutting back, with Braving from an Utaite (VOCALOID cover artist) and Unbreakable Heart from an ex-Sentai song writer. But the rest are established artists and bands (Petit Milady is a new unit, but both Seiyuu have sung professionally).
Opening to Yu- Gi- Oh 5ds (English version) Last Train -Atarashii Asa-Last Train -New Morning-2nd Opening: You say. Arc-V, we've had Bulletrain, a sort of well known Boy Band, and Kensho Ono, and that's it. The rest are no name idols/models whose only released single ever is probably going to be the OP/ED for Arc-V they sung in.