- Winterplay - Don’t Know Why
- Carpark - Don't Know Why We Met
- Jim Gaff - Don't Know Why We're Not Together
- CNBLUE - I don't know why (Live-2011 Winter Tour -In My Head-@Yoyogi National Gymnasium, Tokyo)
- Carpark - Don't Know Why We Met
- 王梓钧 - 我也不知道怎么就放的是这个（I Don't Know Why It's Played）
- Leslie Costa - Don't Know Why We Said Goodbye
- ChaosRush - dont know why when
- Eldon Windyboy - Don't Know Why We Wouldn't [Dubstep] (Bonus Track)
- Bob Spires - Don't Know Why We Bother