How do you change length of music in Imovie9

When you drag the music clip into the movie, make sure you drop it dead center on top of a video clip. Otherwise it might become a background music clip instead (Green or purple background color that surrounds all the clips). When you drag directly onto a movie clip, the sound is represented as a title bar underneath the video clip. To shorten the length, find the end and drag the right edge of that bar, to the left. The mouse cursor should change to a vertical bar with a double-headed arrow on it. When that appears you can drag to the left. Just move the end of the sound clip to the point where you want it to end.

It sounds as though the actual length of the whole clip is already maxed out. Meaning, you cannot make it play longer than it actually already is. In the screenshot above both of the clips are actually longer than the times displayed on them maybe 8sec. each. But I scrunched them down by pulling the right edge of each clip, making them shorter. If I were to go back and want to make them longer I would pull out the right edge. But I couldn't nor will it ever let me pull out beyond 8sec. Because that's literally how long the clip is before I even drop it into iMovie.