I have an app called "Ultimate Guitar Tabs" which allows you to search on songs to get tabs, lyrics, and chord charts for most stuff. The lyrics w/chord charts are great for jamming to a song you've never bothered to learn before. It has an auto-scroll feature so you can start the song and not have to keep messing with your phone while playing bass. Stick it on a music stand, start to autoscroll and play.
The tabs that it provides are the usual hodgepodge of internet tab mistakes, but they are sometimes useful.
Drag the dream into existence
Westone Club Member #18, Vintage Modified Jaguar Club, Rickenbacker # 390, PF #313