Watch the Playing on the A String online guitar lesson by David Hamburger from Blues Guitar For Beginners

A good sense of time is as important to being a good guitarist as a good sense of pitch is to being a good singer. Fortunately, once you start practicing with a click track, jam track or metronome, your newfound awareness of things like beats and bars will lead to you pay more attention to those elements in the music you've always listened to, which in turn will give you a better idea of what you're aiming for in your own playing.
>>Metronome