Pandora (P -4.9%) gives back some of its recent gains after releasing its June audience metrics, which suggest its mobile listening cap is still taking a toll. Pandora's U.S. radio listening share was 7.04%, up from 5.98% a year ago, but down from May's 7.29%, April's 7.33%, and March's 8.05%. Listener hours totaled 1.25B, +17% Y/Y but -7% M/M (can't fully be explained by one less day). Active listeners rose by less than 1% M/M, and 30% Y/Y, to 71.1M. Also: 1) Pandora has updated its iOS apps to feature improved buffering and auto-pause. 2) High-end headphone maker Beats is reportedly thinking of launching a subscription streaming service with AT&T. Shares made new 52-week highs yesterday.