- Ritchie Blackmore's Rainbow - 1975
This is my favorite Rainbow album, it still has soul, with the moving bass and story-based lyrics, it held my attention without becoming boring or preachy. "Man On The Silver Mountain" is one of the few Rainbow songs you will hear on a classic rock radio station (albeit rare indeed), and the song "If You Don't Like Rock 'n' Roll" is downright funky, with a sort of swing feel to it. Great stuff.
Axl Rose Syndrome, but he shows up to acts, and he predates Gun's 'N' Roses by two decades. Oh well, if the shoe fits...
- Long Live Rock 'n' Roll - 1978
There were more releases after Dio left the band, although none even as close as awesome as the original three albums. The mainstream style landed the group a few hits and increased album sales, but Blackmore sold out (I would say the band Rainbow sold out, but Blackmore replaced most of the musicians after every release, so you can't call it a "band" per-se). The Dio-era was by far the best, but he left for greener pastures, landing the short gig as Black Sabbath's frontman, preceding his long solo career. A good trade if you ask me.