Firstly renumber you images*. Make sure that this script won't overwrite anything.
x=1; for i in *.JPG; do counter=$(printf %04d $x); mv "$i" img"$counter".JPG; x=$(($x+1)); done
Then put the images together.
ffmpeg -ss 1 -t 70 -i music.mp3 -r 15 -i img%04d.JPG -b 15M -s 1440x1080 out.avi
The ffmpeg documentation mentions using the "image file demuxer" -f image2 before the input image file name template, but I haven't found that necessary.
Remember that ffmpeg options act on the next input or output, so for example you can set the frame rate of the animation by using -r x before the input image parameter or set the frame rate of the resultant video by using the same switch before the output filename.
In the above example we also add a sound track, starting 1 second into the track and cut after 70 seconds.
* You're images must be numbered sequentially starting at 1.