In terms of vocal melody in the snips, alone, "Zzz..." and "X-Mas" stand out the most.

Ooh it's sounding good, although I am questioning their styling decisions... Like the individual teaser images looked alright but their outfits in this look like what happens when you put on all your highest scoring items in a dress-up game to brute force your way through a stage regardless of what it ends up looking like