I expect that all our readers will be familiar with the trumpet solo in "Penny Lane":
It turns out that it was inspired by Bach's Brandenburg Concerto #2:
This is a particularly interesting version of the concerto performed by the Freiburg Barockorchester using period (early 18th century) instruments. You don't often see a recorder used in chamber music these days, although it was quite common in earlier days (English King Henry VIII composed a number of pieces for Recorder). More to the point of the subject of the post, the trumpet isn't really a trumpet. Rather, it looks like an antique variant of a coronet (I confess to being a little hazy on the type here despite being an old trumpet player back in school). It has a higher pitch than today's trumpet, and in fact sounds very like the pitch of the Piccolo Trumpet used in Penny Lane.
The story is that Paul McCartney was watching a BBC show where the Brandenburg Concerto #2 was performed. McCartney was transfixed by the trumpet performance by David Mason. The music inspired McCartney to add a pseudo-baroque trumpet solo, and the rest is history. McCartney asked Mason to record the solo on Penny Lane, which he did on January 17, 1967.
And thus we see that even The Beatles knew the truth of the old saying: if it's not Baroque, don't fix it.