Jason Kelce was once a finalist for the "Sexiest Man Alive" ... but did you know he's got some major sax appeal too?!?
The Philadelphia Eagles legend joined the Baltimore Ravens' famous marching band on Monday night ... and he showed he's got the skills to delight thousands with a saxophone.
The former NFL center was front and center in the band as he did a bit for his gig as an ESPN "Monday Night Football" analyst .