Area Arts organization:

Los Angeles Philharmonics – http://www.laphil.com/
Junior Chamber Music – http://www.juniorchambermusic.org/
North Torrance Youth Musicians Ensemble – http://www.ntyme.org/
The South Bay Youth Orchestra – http://www.sbyorchestra.com/index.html
Asia America Youth Orchestra (AAYO) – http://www.asiaamericasymphony.org/youth/
Civic Light Opera – http://www.civiclightopera.com/
Peninsula Symphony – http://www.pensym.org/

Tools:

Metronome Online – http://www.metronomeonline.com/
Online Instrument Tuners – http://www.get-tuned.com/online_tuners.php
Essentials of Music – http://www.essentialsofmusic.com/

Other Important Links and Resources:

Southwest Strings – http://www.swstrings.com/
Sheet Music Plus – http://www.sheetmusicplus.com/
The Strings Connection – http://www.stringsconnection.com/index.html
Music Minus One – http://www.musicminusone.com/