I Don't Know Why - The DeMarco Sisters

• Essential Harmony Groups - NOT2CD781

• I Don't Know Why - Andy & David Williams
• I Don't Know Why - Bill McAfee
• I Don't Know Why - Eden Kane
• I Don't Know Why - Linda Scott
• I Don't Know Why - O.V. Wright
• I Don't Know Why - Shawn Colvin
• I Don't Know Why - The Rolling Stones