Actually, a ringback is a lot more enjoyable to listen to then the standard song that plays. My previous phone was an LG and I was able to set any song as a ringback. As I recall, I didn't go through Sprint.
Standard song? No song plays when people call my phone by standard, it just rings, which is what people expect. Calltones are annoying as hell.
And no, this is NOT a feature of the phone. You may have set it from your phone, but your phone has no control over what the other person hears until after you answer it. Until that point it's entirely the carrier handling what audio the caller hears. So while some phones may include a program to handle this built-in, it's easily done from Sprint's site if they don't. Assuming you happen to have nobody who ever calls you who doesn't share your taste in music. Especially a boss.