Listen to Lilly's Theme (From Harry Potter and the Deathly Hallows) (Halloween Party Mix) online. Lilly's Theme (From Harry Potter and the Deathly Hallows) (Halloween Party Mix) is an English language song and is sung by Halloween Party Band. Lilly's Theme (From Harry Potter and the Deathly Hallows) (Halloween Party Mix), from the album Halloween the Ultimate Party 2012, was released in the year 2012. The duration of the song is 1:55. Download English songs online from JioSaavn.