A portal to another room!
#10: Swinging Doors by Merle Haggard
#9: Open the Door, Homer by Thunderclap Newman
#8: Behind That Locked Door by George Harrison
#7: The Door Into Summer by The Monkees
#6: Open The Door by Roger Hodgson
#5: House of 4 Doors, Pt. 1 by The Moody Blues
#4: Back Door Man by The Doors
#3: Let My Love Open The Door by Pete Townshend
#2: Lookin' Out My Back Door by Creedence Clearwater Revival
#1: Knockin' On Heaven's Door by Bob Dylan