| Building up your hands - both of 'em - is important. I would recommend playing scales, first to learn the notes (keys E,A,D and G will do virtually any BG tune), then play 'em as fast as you can.
I find that practicing new music on a bass at home is not only tough, but somewhat boring. If I can find a recording of the song I loop it and play along with it over and over to get the bass line, then I play it over and over while singing only, then I do both. |