Traditional songs often have really interesting, even tough changes in them. If you are playing them from a chart without any references, keep your tone warm. Just mark out the changes without trying to groove too much.
I figured the other guys gave you plenty of practice philosophy this week so I thought I'd give you something to actually practice! Here's a simple passing tone that can really add to your changes. I'm using Lord I Need You for this example, but you can use this in almost any song.
I am amazed by just how many people end up with a bass that is completely wrong for their application. This is usually because not only do they have no idea what they need, but bass tone can be a bit of a mystery.
For this green room post, here are some great little intros. Sometimes it’s great to get into a song with a little something before the down beat. It's like a drummer leading into a song with a fill. Here are a few simple ones to get you started.