[Mick]

Only one band had FOUR #1 albums on the Billboard 200 in a single calendar year. Which band was it?

had to be from the 1960s or earlier as putting out four albums in a year is a big lift

It was from the 1960s. And there are only three bands who had exactly THREE #1 albums on the Billboard 200 in a single calendar year. And all three of THOSE bands were from the 1960s.

[Mick]

Only one band had FOUR #1 albums on the Billboard 200 in a single calendar year. Which band was it?

had to be from the 1960s or earlier as putting out four albums in a year is a big lift

It was from the 1960s. And there are only three bands who had exactly THREE #1 albums on the Billboard 200 in a single calendar year. And all three of THOSE bands were from the 1960s.