Cassie is back with rapper Fabolous on track ‘Radio’ taken off the Diddy and DJ Prostyle hosted mixtape ‘Bad Boy Presents The Preview.’

Over the instrumental for Mobb Deep’s 'Shook Ones Pt. II,' the 25-year-old sings about old R&B jams and how they played out in real life through her relationships.

After a verse from Fab the mellow tune has Cassie singing: “Who knew that they were trying to tell me about you and the crazy things you do?/ How could you be so cruel?”

At the end of the mixtape, Diddy announced that 'King of Hearts' will be the first single off Cassie’s sophomore album, due in 2012.