Song: "I Can't Tell You Why"
Artist: Eagles
Peak position on the Cashbox Singles chart: #9
Number of weeks on the Cashbox Singles chart: 16
Weekly data:
| Week ending | Rank | Title | Artist | Label |
|---|---|---|---|---|
| February 23, 1980 | 53 | I Can't Tell You Why | Eagles | Asylum 46608 |
| March 1, 1980 | 41 | I Can't Tell You Why | Eagles | Asylum 46608 |
| March 8, 1980 | 32 | I Can't Tell You Why | Eagles | Asylum 46608 |
| March 15, 1980 | 25 | I Can't Tell You Why | Eagles | Asylum 46608 |
| March 22, 1980 | 18 | I Can't Tell You Why | Eagles | Asylum 46608 |
| March 29, 1980 | 14 | I Can't Tell You Why | Eagles | Asylum 46608 |
| April 5, 1980 | 12 | I Can't Tell You Why | Eagles | Asylum 46608 |
| April 12, 1980 | 10 | I Can't Tell You Why | Eagles | Asylum 46608 |
| April 19, 1980 | 10 | I Can't Tell You Why | Eagles | Asylum 46608 |
| April 26, 1980 | 9 | I Can't Tell You Why | Eagles | Asylum 46608 |
| May 3, 1980 | 11 | I Can't Tell You Why | Eagles | Asylum 46608 |
| May 10, 1980 | 22 | I Can't Tell You Why | Eagles | Asylum 46608 |
| May 17, 1980 | 33 | I Can't Tell You Why | Eagles | Asylum 46608 |
| May 24, 1980 | 51 | I Can't Tell You Why | Eagles | Asylum 46608 |
| May 31, 1980 | 56 | I Can't Tell You Why | Eagles | Asylum 46608 |
| June 7, 1980 | 91 | I Can't Tell You Why | Eagles | Asylum 46608 |
Rankings greater than 100 are from the Cashbox 'Looking Ahead' charts.