AM/FM radio represented the largest share of music...

radio -- including subscription-based and free services -- grew by 6 percentage points over Q4 2011, to 23 percent of total music listening time, NPD said. In the same age bracket, among listeners who stream music, Pandora’s free version led with 39 percent listener share, followed by iHeartRadio (11 percent), Spotify’s free version (9 percent), Grooveshark (3 percent), Slacker (2 percent), Pandora One (2 percent), TuneIn (2 percent), last.fm (2 percent) and Xbox Music (2 percent), NPD said. Sixty-two percent of 13-35s who used streaming services reported an uptick in their usage for the period, and 51 percent said most of their music listening took place in their vehicle. In the 36-and-older age group, Internet radio accounted for 13 percent of total music listening, while AM/FM dominated music listening time with 41 percent, NPD said. NPD’s “Music Acquisition Monitor” also reported a decline in consumers listening to CDs and digital music files. In overall share of music listening, CD listening dropped 2 percentage points to 9 percent in 2012, while satellite radio and on-demand held at 14 percent and 5 percent. Music files saw a 1 percentage point dip to 16 percent of listening share versus Q4 2011, NPD said. More than half of Pandora and iHeartRadio listeners used their mobile phone to access those services, NPD said, and roughly one in five Pandora or iHeartRadio users are also connecting to those services in their cars, NPD said. The results were based on 7,600 NPD consumer surveys, with data weighted to represent U.S. population of Internet users age 13 and older.