deep cut

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

Noun

 * 1)  An obscure song by a well known musician.
 * 2) * 2015, "Weekend Rock Question: What’s the Best Rolling Stones Deep Cut?", Rolling Stone, 10 April
 * 3) * 2016, Nate Chinen, "Norah Jones Returns to Her Jazz Roots", The New York Times, 15 September
 * "With luck, her tour will include the standout Neil Young cover she included on “Day Breaks” — a deep cut called “Don’t Be Denied,” from 1973."
 * 1) * 2017, Eric Renner Brown et al, "New Music Friday: 14 releases to hear now", Entertainment Weekly, 26 May
 * "But there are surprises, too, like the spooky Live/Dead deep cut “Death Don’t Have No Mercy..."
 * 1)  Any obscure work, a thing likely to be recognized only by a connoisseur.
 * 2) * 2015, Vikram Murthi, "This Week in Home Video: ‘Age of Adaline’ with Blake Lively, ‘Dressed to Kill’ on Criterion, and More", IndieWire, 8 September
 * "...there’s still an interesting batch of films on Blu-ray and DVD, like a Blake Lively vehicle, a Brian De Palma classic, and a Wes Craven deep cut."
 * 1) * 2015, Vikram Murthi, "This Week in Home Video: ‘Age of Adaline’ with Blake Lively, ‘Dressed to Kill’ on Criterion, and More", IndieWire, 8 September
 * "...there’s still an interesting batch of films on Blu-ray and DVD, like a Blake Lively vehicle, a Brian De Palma classic, and a Wes Craven deep cut."