What does "deep cut" mean?

An obscure song by a well known musician.

What is a synonym for "deep cut"?

Common synonyms include: budget cut, decrease, drastic, extreme, gash, gashes.

/ˈdip kʌt/ noun

noun ·Rare ·Advanced level

Noun

1
An obscure song by a well known musician. idiomatic
""Dig a Pony" is my favorite Beatles deep cut."
2
Any obscure work, a thing likely to be recognized only by a connoisseur. idiomatic
"I'm a fan of Kurosawa's films, but The Bad Sleep Well is a bit of a deep cut."
3
Used other than figuratively or idiomatically: see deep, cut.

""Dig a Pony" is my favorite Beatles deep cut."

A cut (track of a vinyl record) which is seen as being buried deep in an album.