Your maximum streaming rate from an uncompressed CD is 1.4 Mbps. Even the old 802.11b speed (10 Mpbs) is adequate so the g is more than fine. If you wish to play any of the lossy compressed file formats you're even better off since those bit rates tend to run from 128 to 320 Kbps.
Of course, this assumes two things. First of all the device that receives the music data stream should be buffered. This would allow momentary hiccups (due to other traffic on the connection) to be handled. The second item is that you are not running a massive amount of other traffic on the network. Of course, that could also interfere with a wired connection. However, I've got six devices sharing my home network and have never had an interruption issue while playing my SB3.
Of course, this assumes two things. First of all the device that receives the music data stream should be buffered. This would allow momentary hiccups (due to other traffic on the connection) to be handled. The second item is that you are not running a massive amount of other traffic on the network. Of course, that could also interfere with a wired connection. However, I've got six devices sharing my home network and have never had an interruption issue while playing my SB3.