Make picture bounce in sync with music

If keyframes are too complex for you After Effects isn't your tool of choice. I've got 10 year old cub scouts that can use AE. I'd take the bull by the horns and dive into the basics by following this link. 

Once you have a little more confidence you can run through a tutorial, any tutorial, on using Audio Keyframes. The procedure is very easy. It goes something like this:

1. Put the audio in the timeline.
2. Use Animate>Keyframe Assistant>Convert Audio to Keyframes to create a null named Audio Amplitude and effects sliders named Left, Right and Both
3. Put the image you want to control in the timeline and press S to reveal the scale property.
4. Alt click or Option click on the stopwatch to begin an expression.
5. Use the pickwhip to connect scale to the Both Channels slider.
6. Open up the graph editor, select the Audio Amplitude Both Channels Slider property to reveal he range of the levels you want to use for your animation.
7. 
8. In this case I want to use 25 to 60 so anything below 25 is 50% scale and anything above 40 is 100% scale
9. Modify the expression created in step 5 to look like this:

10. temp = thisComp.layer("Audio Amplitude").effect("Both Channels")("Slider");
    s = ease(temp, 25, 40, 50, 100);
    [s, s]

You're done.

Do a Google Search for Controlling a layer with audio in After Effects and you'll find dozens of tutorials.