Fireflies-Owl City
Nobody has done a bass tab for this song so here it is

bass starts at 0:21
Verse:
G|----------------------------|
D|----------------------------|
A|-----6-66-6-----------------|x4
E|-6-6--------4-4--4-4444-4h6-|

Chorus: (is not the exact rhythm just listen to the song)
G|-------------------------------------------|
D|-------------------------------------------|
A|--------3-33----------------6-66-----------|
E|--4-44------6-6-6-666-4-44-------3-33-4-44-|

G|--------------------------------------|
D|--------------------------------------|
A|------6-66--------3-333-------6-666-8-|
E|-4-44---------4-6-------4-444---------|

Then just play the verse and the chorus