Conversation so far:
What was notable about Adam Clayton's style?
Adam Clayton's style of bass guitar playing is noted for what instructor Patrick Pfeiffer called harmonic syncopation.
Does Adam Clayton have any other influences?
Are there any other interesting aspects about Adam Clayton?
When Adam Clayton first joined the fledgling U2, he did not have formal training in the bass.

Question: When did he get formal training?
Self-contained rewrite: When did Adam Clayton get formal training in the bass?