SAN FRANCISCO -- Accustomed to performing before throngs of people, Matt Cain and Barry Zito entertained fans in a vastly different way Sunday night.

The pair of Giants pitchers made a brief appearance during the rock band Train's concert at The Fillmore. Zito played guitar and sang with the group during their rendition of "Save Me San Francisco." Then Zito and Cain joined forces to belt out Journey's "Don't Stop Believin'," which is played on the public-address system when the Giants trail in the late innings at AT&T Park as a rallying cry of sorts for fans.

"Barry and I had a blast. That was cool," Cain said. "You always wonder, what would it be like to go on stage and sing? I can't sing worth anything. But that's a great song to be able to go out there and get the crowd involved. Everybody had a lot of fun with it."

Cain discovered that the stage differs greatly from the pitcher's mound: "Now you see why those guys sweat so much. It's hot up on the stage! All those lights and everything."

Zito admitted that he was challenged to keep up with Patrick Monahan, Train's lead singer.

"He has a real high voice," Zito said. "I was at the top of my range trying to sing that hook with him."

Zito's association with San Francisco-based Train began years ago, leading to Sunday's gig.

"I've always been a fan of theirs," Zito said. "I've had a great time meeting those guys and establishing a relationship with them."

Wilson gets more information about injury

SAN FRANCISCO -- Giants closer Brian Wilson has a "moderate" sprain of the ulnar collateral ligament in his right elbow, an injury that doesn't always require surgery, according to a CSNBayArea.com report Monday.

This hasn't stopped Wilson, who's expected to be out for the season, from seeking multiple opinions regarding his injury. Wilson, who indicated Sunday that he's favoring another Tommy John reconstructive procedure on his elbow, visited Dr. Lewis Yocum at the orthopedist's Southern California office Monday. Wilson also is scheduled to see Dr. James Andrews in Pensacola, Fla., on Wednesday.

Another ailing Giant, second baseman Freddy Sanchez, endured what manager Bruce Bochy described as a "minor" setback when he felt soreness in his right shoulder Monday.

Sanchez, who dislocated his shoulder last June, experienced the discomfort while playing four innings in an extended spring training game in Arizona.

Bochy said that Sanchez likely would have started a Minor League injury rehabilitation assignment as early as Tuesday if all had gone smoothly. Instead, Sanchez will rest for a day or two and report to Class A San Jose on Wednesday or Thursday.