Song: "Groove Line"
Artist: Heatwave
Peak position on the Cashbox Singles chart: #10
Number of weeks on the Cashbox Singles chart: 21
Weekly data:
| Week ending | Rank | Title | Artist | Label |
|---|---|---|---|---|
| April 15, 1978 | 100 | Groove Line | Heatwave | Epic 50524 |
| April 22, 1978 | 90 | Groove Line | Heatwave | Epic 50524 |
| April 29, 1978 | 82 | Groove Line | Heatwave | Epic 50524 |
| May 6, 1978 | 72 | Groove Line | Heatwave | Epic 50524 |
| May 13, 1978 | 62 | Groove Line | Heatwave | Epic 50524 |
| May 20, 1978 | 49 | Groove Line | Heatwave | Epic 50524 |
| May 27, 1978 | 40 | Groove Line | Heatwave | Epic 50524 |
| June 3, 1978 | 32 | Groove Line | Heatwave | Epic 50524 |
| June 10, 1978 | 26 | Groove Line | Heatwave | Epic 50524 |
| June 17, 1978 | 17 | Groove Line | Heatwave | Epic 50524 |
| June 24, 1978 | 15 | Groove Line | Heatwave | Epic 50524 |
| July 1, 1978 | 12 | Groove Line | Heatwave | Epic 50524 |
| July 8, 1978 | 10 | Groove Line | Heatwave | Epic 50524 |
| July 15, 1978 | 10 | Groove Line | Heatwave | Epic 50524 |
| July 22, 1978 | 13 | Groove Line | Heatwave | Epic 50524 |
| July 29, 1978 | 28 | Groove Line | Heatwave | Epic 50524 |
| August 5, 1978 | 36 | Groove Line | Heatwave | Epic 50524 |
| August 12, 1978 | 46 | Groove Line | Heatwave | Epic 50524 |
| August 19, 1978 | 51 | Groove Line | Heatwave | Epic 50524 |
| August 26, 1978 | 84 | Groove Line | Heatwave | Epic 50524 |
| September 2, 1978 | 95 | Groove Line | Heatwave | Epic 50524 |
Rankings greater than 100 are from the Cashbox 'Looking Ahead' charts.