I've been reading a bit about this topic lately. According to Randy Price, who runs the Cash Box charts "fan site," Cash Box was strictly a sales-based chart until the late seventies, whereas Billboard combined sales and airplay from late 1958 on. I can't help but wonder if this makes Cashbox more accurate for this period. They're almost identical from week to week, but there are songs that were number one in Cashbox and not in Billboard, and vice versa. In fact, if you go by Cashbox's sales-based chart, then Elvis, The Beatles and The Supremes each had one extra #1 hit than they had on Billboard's Hot 100: Supremes - I'm Gonna Make You Love Me Beatles - Twist and Shout, Yellow Submarine (subtracting Nowhere Man, which did not hit #1 in Cashbox) Elvis - Return to Sender, In the Ghetto, Burning Love (subtracting Hard-Headed Woman and I Want You, I Need You, I Love You, which each peaked at #2) I've heard that in the sixties, at least, Cashbox was at least as widely read and respected as Billboard was.