In 1967 at Abbey Road Studios Mason recorded the piccolo trumpet solo which is a prominent part of The Beatles' song "Penny Lane". Although such solos are almost commonplace now this was extremely innovative at the time and has caused much debate ever since. The solo, inspired by a performance of Bach's 2nd Brandenburg Concerto, is in a mock-Baroque style for which the piccolo trumpet (a small instrument built about one octave higher than the standard instrument) is particularly suited, having a clean and clear sound which penetrates well through thicker midrange textures.
Transcription of the beginning of the "Penny Lane" solo