Ado Annie D'Ysquith said: "What's the deal with Glen Kelly, bk?"
Glen Kelly is a prolific Dance Arranger and Musical Arranger. In that capacity, he was the unofficial co-composer of The Producers and Young Frankenstein, basically turning Mel's melodies into real Broadway songs. He has also arranged a bunch of Casey Nicholaw, Alan Menken, and Susan Stroman shows (Something Rotten, The Prom, Mean Girls, Aladdin, Bullets Over Bway, Spamalot, Drowsy, Beauty, etc).
bk is being a little snarky, but the scores of all those shows probably looked quite different before Glen Kelly got his hands on them.