No. 3 - Mike Oldfield - Tubular Bells (1973)
Continuing with the theme of the more tracks the better and the studio as a place to create, we come to Tubular Bells.
Recorded by a nineteen year old Mike Oldfield who plays and sings nearly everything on the record, I'm not sure if Tubular Bells could have been created anywhere outside a multi-track studio. Of course, it's much easier now with digital recording, but at the time it was quite the feat to start and stop the tape to record and playback what was being done and still have a usable recording when finished.
The album got a boost when music from it was used in the film The Exorcist, and launched both Mike Oldfield's career but also Virgin Records.