Activebass.com is a very informative site and includes a lot of lessons & resources. The site boasts over 8,000 bass lessons in total. The bass lessons are separated into 22 different genres.

Users can send their own MP3s in with a small article and profile of their respective bands.

The jamming tool is also very useful and easy to use.

Visit Site: http://www.activebass.com/
Levels: Beginner, Intermediate, Advanced

Other Resources:
1. Tablatures
2. Track builder
3. Articles

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