Song: "Let's Get Serious"
Artist: Jermaine Jackson
Peak position on the Cashbox Singles chart: #9
Number of weeks on the Cashbox Singles chart: 25
Weekly data:
| Week ending | Rank | Title | Artist | Label |
|---|---|---|---|---|
| March 22, 1980 | 88 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| March 29, 1980 | 76 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| April 5, 1980 | 69 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| April 12, 1980 | 64 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| April 19, 1980 | 55 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| April 26, 1980 | 47 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| May 3, 1980 | 39 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| May 10, 1980 | 34 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| May 17, 1980 | 30 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| May 24, 1980 | 26 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| May 31, 1980 | 20 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| June 7, 1980 | 17 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| June 14, 1980 | 15 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| June 21, 1980 | 14 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| June 28, 1980 | 12 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| July 5, 1980 | 10 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| July 12, 1980 | 9 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| July 19, 1980 | 9 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| July 26, 1980 | 9 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| August 2, 1980 | 12 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| August 9, 1980 | 14 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| August 16, 1980 | 41 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| August 23, 1980 | 55 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| August 30, 1980 | 85 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
| September 6, 1980 | 98 | Let's Get Serious | Jermaine Jackson | Motown 1469 |
Rankings greater than 100 are from the Cashbox 'Looking Ahead' charts.