Although I had never seen 'The Exorcist', which features the probably best known theme written by MO, I still knew Tubular Bells (TB) partly from some C64 sound demo (ah, those were the days!). So when I eventually listened to TB II at my friend's place, the main theme (from Sentinel) sounded familiar to me, and I instantly liked it very much.
Quite some time passed until I finally began to overcome the prejudice mentioned above, which enabled me to liking TB II enough to purchasing it myself.
But the bias was still there, and I went through some cycles of borrowing MO albums from my friend, listening to them…
Mike Oldfield