Due to it's favored use in Dub, this may turn into a reggae list, but I'm in love with the melodica right now Gorrilaz - Clint Eastwood Dido - Honestly OK Just about anything by Agustus Pablo, esp. Meditation Dub, (meets the Upsetters) Vibrate On, Dub Organizer, East of the River Nile,dd Yabba You - Give Praises Lee Perry - (Scratch the) Dub Organizer
Everything Counts by Depeche Mode. Just about everything by Clinic. The melodica has always had a "creepy" feeling to it, and these guys put that to use.