 This is American Top 40. I'm Casey Kasem, and our special countdown is still cooking. The 40 top artists of the 1970s. We've just heard 14 of them, and the countdown goes on. Number 26. Here is Motown's all-time biggest-selling male vocal group. And there's not a Jackson in the bunch. This group's a bit older than the J5. They've had a total of 39 chart records, 13 of them reaching the top 10, and four of those hitting number one.