Acts where I bought every one of their studio releases - 5 albums minimum
29 - Alice Cooper: From 1969 to Present
every time he’d put out a dud, he’d follow that up with an all-time favorite… so I always stuck with him. I’ve seen him live, watched the specials and guest spots on TV. Along with the studio LPs, I own a live album, the original greatest hits and a career box set full of rarities.
12 - The Beatles: 1963 to 1970 (Note: there were 17 in the US)
I also have several compilations, the Anthologies, the old “Beatles Story” LP, Live at the BBC, Live at the Hollywood Bowl, etc
12 - XTC: 1972 to 2000
beyond their 12 studio albums, there’s also Dukes of Stratosphere
8 - Roxy Music: 1972 to 1982
5 - Simon & Garfunkel: 1964 to 1970
Acts where I bought some of their albums (usually the early stuff, maybe a few later releases)
10 - Nazareth (mostly 70s) and Bob Dylan (mostly 60s) - several Spotify free listens and library checkouts, but 10 are what I own for the studio releases)
9 - Judas Priest (from mid 70s to early 80s - and the later reunion with Halford)
8 - Queen and Aimee Mann
7 - Devo and Ramones
6 - John Lennon
5 - Monkees, Paul McCartney, Pixies
Others: I like the Tubes, but only have 3 studio LPs (their first 2, and the Completion Backwards Principal), Billy Idol? I own 4, plus the first EP and a couple of compilations.