Auckland Libraries has recently subscribed to a new e-resource called Zinio. The Zinio subscription allows you to read a number of magazines in electronic form for free. There's definitely a lot of titles there, but I had a squizz specifically at the music ones and here's what they've got right now:

Billboard, Guitarist, Opera Canada, Guitar Techniques, Rhythm, Total Guitar, XXL, Guitar Player, Computer Music, Electronic Musician, Future Music, Recording and Music Production, Rolling Stone.

There's some good reading there. If you'd like to know how to download these to your computer or portable device then head over to the Auckland Libraries website and read the info under Zinio.