PTX, Vol. IV - Classics is the fifth extended play album by the a cappella group Pentatonix. It was released by RCA Records on April 7, 2017, and is their first EP since 2014's PTX, Vol. III.

Their second work after PTXmas to not feature any original material, the album marks a departure from the group's typical sound, which mostly consists of either modern pop songs or Christmas music, choosing instead to focus on standarts of rock, blues, country, and older pop music.

"Jolene", featuring the original artist, Dolly Parton, earned her and Pentatonix a Grammy Award for Best Country Duo/Group Performance.

The group's cover of "Jolene", originally released as a single and later included in the EP, was particularly praised. Julia Brucculieri of The Huffington Post called the version "a hauntingly beautiful a cappella update" Markos Papadatos of Digital Journal called it a "stellar version", stating that "Pentatonix proves yet again that they can do no wrong with anything they sing or cover. The addition of Dolly Parton helps elevate 'Jolene' to a higher level, and they prove that it is possible for heaven to be a place on earth. Their a cappella rendition earns five out of five stars." Stefan Kyriazis of the Daily Express called it a "remarkable new version of the old standard. 'Jolene' was released way back in 1973 but has never sounded fresher."

Sara Vallone of the Independent Journal Review stated that "Pentatonix just did justice to Dolly Parton's 'Jolene'", and that "Parton is proving once again just how timeless she truly is". The cover eventually won the Grammy Award for Best Country Duo/Group Performance. Parton had been nominated for Best Female Country Vocal Performance twice for the song, first for its 1973 original release and then in 1976 for a live version; this resulted in the song earning her a Grammy 44 years after its original release.

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