The trick will be to attract enough users in the earlydays with the promise of free music, then persuade them to upgrade to the ad-free subscription option.
Mr. Anderson, who worked at the retailer for 36 years since its earlydays as a stereo chain called Sound of Music, said Mr. Dunn's appointment as CEO in 2009 had been very popular with rank-and-file workers, who saw him as one of their own.