Related Clues:

• The "kissing disease"
• One-third of ''tri-''
• It's less than stereo
• Prefix for rail
• Like most pre-'60s recordings
• A third of tri-
• One-third of tri-
• What most of Phil Spector's catalog was recorded in
• "The kissing disease," casually
• It's not stereo
• Where you might see a car boot sale with free parking?
• It preceded stereo
• So-called kissing disease, familiarly
• "The kissing disease," for short
• Prefix like uni-