PTX Vol. IV: Classics

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. It is their final release with original member Avi Kaplan, who left the group later that year.
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 standards 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.