Peyton Manning -- Calls In 1st Strings ... For Orchestra Debut

He's 6'5", 230 pounds, and has a laser rocket arm ... and now Peyton Manning has proved -- he can also conduct an orchestra like a champ!!!

Manning and a bunch of his Denver Broncos teammates grabbed their batons and took over the Taste of the Broncos event at Mile High last night ... hookin' up with the Colorado Symphony to raise money for the Food Bank of the Rockies.

Peyton conducted the orchestra through a version of "Rocky Top" -- a tribute to the University of Tennessee.

Overall, not a bad job ... but let's face it -- he's no Shaq.