Earlier this year, Pantera's fourth major label album, The Great Southern Trendkill, turned 20. On Oct. 21, it'll get celebrated with The Great Southern Outtakes, a vinyl-only release with 10 previously unheard tracks. Today we've got two of 'em, early mixes of "Drag the Waters" and "Floods":

How notable the differences are will depend on your level of audiohead-ness/Pantera stan-dom...but there's never a bad time to press play on some Pantera. Drummer Vinnie Paul—brother of guitar god and band-mate Dimebag Darrell, who was murdered onstage by a gunman in 2004—tells Rolling Stone that "Drag the Waters" "had a great groove with a cool turn-around and was the most Zeppelin-influenced track we ever wrote. We only played it live two times."

The Great Southern Outtakes will coincide with the double-disc The Great Southern Trendkill: 20th Anniversary Edition. For those looking for a little more context while headbanging to the new takes on these classics: Trendkill was the Texas band's penultimate album, coming two years after Far Beyond Driven and followed by the 2000 swan song Reinventing the Steel. In 2013, Guitar World named the solo on "Floods" their No. 19 of all time.

Next, journey inside Pantera frontman Phil Anselmo's house: