When Jimmy Iovine, the co-founder and CEO of Beats Electronics, launches his much-anticipated subscription music service in the coming months, he wants to do so with some big marketing muscle help from AT&T. In recent weeks, Iovine has been in talks with top execs from the major music labels and AT&T, according to people familiar with the talks. The goal, sources say, is to bundle Beats’ upcoming service, called Daisy, with AT&T data plans as a way to gain a big audience quickly. The potential partners are in the early stages of working out the details, sources say. The talks could fall apart or end up involving a different carrier. Such a bundling would likely offer consumers a free period of music access with the goal of converting them to paying subscribers. On the table now, sources say, is how much free music to offer and who would eat the costs. Spokespeople for AT&T and Beats declined to comment.