Searching for Loops
The loop browser will open in the bottom of the GarageBand window. The browser can be displayed in column or button view. By default, the window will probably appear in button view; to change this, click on the buttons in the bottom left corner.
In button view, simply click on the buttons that describe the loops you want. For example, if I'm looking for a cheerful rock guitar loop, GarageBand will search for loops with those attributes when I highlight those buttons.
To expand the number of buttons shown, click on the brushed metal bar above the loop browser (with the buttons on it) and drag it up. Also, if you'd like to move or reorganize the buttons, simply drag a button to the desired location; it will switch places with whatever button is currently in that location.
In column view, each selection you make narrows your results and allows you to make further selections in columns to the right.
You can also search the loop library for certain words in either view. Enter the term you'd like to search for in the box with a magnifying glass at the bottom of the loop browser.
To limit your search by scale (major or minor), click on the drop-down menu beside "scale."
Watch the video
Part 3.1: Searching
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Flash movie
Entire Tutorial