Possible Clues:

• Dreamy musical piece
• Night picture
• Short romantic piece of music - in the night?
• Dreamy composition
• I take a dim view reporting what someone once did to the Portland vase?
• The lovely sound of Con, perhaps, by the sound of it.
• Once danced the twist in, to music
• Once on the move, switch in to music
• Chopin work
• First off, encounter moving piece of music