Umphrey’s McGee is the second cousin of band member Brendan Bayliss. He is a lawyer in Southern Mississippi and has absolutely nothing to do with the band except having lent it his — and its — name.
Formed in 1997, in South Bend, Indiana, they recorded their first album, Greatest Hits Volume III in 1997. (No they had had no hits by then of course). Umphrey’s later had a live release, One Fat Sucka and then a DVD, Live From The Lake Coast which displays the band's live presentation, light show and all.
Live performances define this band and from their marketing site this description does quite well:
Umphrey’s McGee is, in the end, a wicked brew. One cup of Jam, 1/2 cup of Metal (heavy), 2 tablespoons of Pop, one cup of Prog, 1/2 cup of Jazz and a pinch of country, all steeped for three hours (with a 20 minute intermission between sets).