What is the absolute phrase of "music blaring, the car sped down the highway on the way to the beach"?

The absolute phrase of "Music blaring, the car sped down the highway on the way to the beach" is "music blearing".

Explanation: An absolute phrase is a phrase that usually contains a noun and a participle. Moreover, it can also include modifiers and/or objects. An absolute phrase  is generally placed at the beginning of a sentence and it is always separated from the rest of the elements by means of a comma. In the sentence provided, "music blearing" is the absolute phrase because it contains a noun ("music") and a participle ("blearing"). Furthermore, it has been placed at the beginning and it has been separated from the rest of the sentence.