Every Em9 position on bass, with the songs that play it.
0-x-0-0
x-2-0-0
x-2-2-4 (fret 2)
x-5-5-x (fret 5)
x-x-5-7 (fret 5)
x-x-9-9 (fret 9)
x-10-9-9 (fret 9)
x-x-12-12 (fret 12)
x-14-14-16 (fret 14)