0592. John Mayall & The Bluesbreakers
Blues Breakers with Eric Clapton

Apart from the general non-consensus whether this album's called "John Mayall & the Blues Breakers - Blues Breakers with Eric Clapton", "John Mayall - Blues Breakers with Eric Clapton" or "John Mayall with Eric Clapton - Blues Breakers", I'm a bit amazed at how leisurly this seems to have been made.
The cover photo shows the group stitting haphazardly outside somewhere, and half the songs are blues standards and other covers.

That doesn't mean it's a sloppy piece of work, though, cause it's good. They know what they're doing and with such skill that it seems almost effortlessly done.

However, I like Clapton better when he's embedded in harder blues rock (like Derek & The Dominos), where his guitar licks really blaze across the tracks (like Cream - which Eric and fellow ex-Bluesbreaker Jack Bruce formed just after this album), so while this isn't the sharpest high-note on the list, it's still a fully acceptable album.
Without it, there might not have been a whole lot of good music created in an attempt to copy it.