Song: "Heartless"
Artist: Heart
Peak position on the Cashbox Singles chart: #18
Number of weeks on the Cashbox Singles chart: 17
Weekly data:
| Week ending | Rank | Title | Artist | Label |
|---|---|---|---|---|
| April 8, 1978 | 82 | Heartless | Heart | Mushroom 7031 |
| April 15, 1978 | 73 | Heartless | Heart | Mushroom 7031 |
| April 22, 1978 | 62 | Heartless | Heart | Mushroom 7031 |
| April 29, 1978 | 51 | Heartless | Heart | Mushroom 7031 |
| May 6, 1978 | 43 | Heartless | Heart | Mushroom 7031 |
| May 13, 1978 | 37 | Heartless | Heart | Mushroom 7031 |
| May 20, 1978 | 33 | Heartless | Heart | Mushroom 7031 |
| May 27, 1978 | 28 | Heartless | Heart | Mushroom 7031 |
| June 3, 1978 | 24 | Heartless | Heart | Mushroom 7031 |
| June 10, 1978 | 21 | Heartless | Heart | Mushroom 7031 |
| June 17, 1978 | 18 | Heartless | Heart | Mushroom 7031 |
| June 24, 1978 | 18 | Heartless | Heart | Mushroom 7031 |
| July 1, 1978 | 29 | Heartless | Heart | Mushroom 7031 |
| July 8, 1978 | 45 | Heartless | Heart | Mushroom 7031 |
| July 15, 1978 | 64 | Heartless | Heart | Mushroom 7031 |
| July 22, 1978 | 76 | Heartless | Heart | Mushroom 7031 |
| July 29, 1978 | 100 | Heartless | Heart | Mushroom 7031 |
Rankings greater than 100 are from the Cashbox 'Looking Ahead' charts.