During Marcus' audition for the record bigwigs, he was called away and Dahlia had to jump on stage in his place. Everybody loved her, and Sugar decided to sign her as well. Marcus and Drew Jacobs, the spoiled brat who is after Sugar-man believe that Sugar wants to discover Dahlia's other talents as well.
Sugar seems to be only interested in the bucks though.
This won't stop him from coming in between Marcus and Dahlia though.