Answer:

silentnight

AnswerCrossword Clue
SILENTNIGHTStart of a seasonal refrain
SILENTNIGHT"...sleep in heavenly peace..."
SILENTNIGHTPopular Christmas carol
SILENTNIGHTCustomary carol
SILENTNIGHTChristmas song
SILENTNIGHTSeasonal song.
SILENTNIGHTSong new parents long for?
SILENTNIGHTSol la sol mi sol la sol mi
SILENTNIGHTSong that ends "Full of heavenly joy!"
SILENTNIGHTSong of 1859 ... or what the five circled letters represent?
SILENTNIGHTChristmas carol
SILENTNIGHTClassic Christmas carol