Stanshall introduces more instruments in Part One after the repetition of a bass phrase that has less than 11 bars .
After the 10-bar bass phrase is repeated several times , Stanshall introduces many of the instruments appearing in Part One up to then , beginning with the keyboards , followed by glockenspiel and all guitars before the tubular bells are announced , the ensemble becoming more dynamic and full as more instruments are announced .
Tubular Bells