He might no longer be on tour with Bon Jovi, but Richie Sambora is still breaking Rock 'n' Roll's glass ceiling -- because as Breaking Celebrity News has exclusively learned, the rocker will perform the world famous "Call to the Post" at this weekend's Breeder's Cup at Santa Anita Park in Arcadia, Calif.

It's a MAJOR deviation from thoroughbred tradition: The Call to the Post has almost always been performed on a bugle to signal that all mounts should be at the paddock exit in order to proceed to the track to begin the post parade.

However, rock legend Sambora, 54, will perform the call on guitar at the richest event in horse racing, a source has revealed.

The Breeder's Cup World Championships will be held November 1-2, comprising 15 races with more than $25 million in prize money.

As we previously reported, Sambora did not make a number of appearances on Bon Jovi's current Because We Can tour after a bitter dispute with frontman Jon Bon Jovi.