Even with a few days to think about it, Jake Gyllenhaal has no idea how he pulled off singing a Stephen Sondheim classic during Sunday night's all-star charity tribute to the Broadway legend on his 90th birthday, "Take Me To The World: A Sondheim 90th Birthday." Gyllenhaal sang "Move On" from Sunday in the Park with George -- which he performed on Broadway in 2016 -- with his former co-star Annaleigh Ashford during the special and on Tuesday Night's A Late Show, host Stephen Colbert asked how he managed his command performance.Playing a clip of Gyllenhaal crooning the song enthusiastically from what looks like a spare bedroom with one AirPod in his right ear, harmonizing perfectly with Ashford, Colbert asked how he was able to sing the song.