Music or works of art that are sirenic are so beautiful that they captivate your attention and almost put you in a trance, such that you want to keep listening or looking.
Sirenic comes from the noun siren. While we don't think of sirens on emergency vehicles as particularly beautiful sounds, the word siren comes from the Greek myth of the sea nymphs, called sirens, who were part-woman and part-bird. Sailors on ships passing nearby would be lured toward the sirens' beautiful, seductive singing, and the sailors' ships were then smashed on the rocks. Our emergency sound, even though not beautiful, is called a siren because it captures people's attention.