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