I Don't Know Why - Andy & David Williams

• Entered the UK chart on 18 March 1973 and spent 5 weeks in the charts, reaching a high of number 37.

• 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 DeMarco Sisters
• I Don't Know Why - The Rolling Stones