Here is a Bass Guitar Tutorial on Another One Bites the Dust by Queen with TAB on screen.
0:00 Intro
0:34 Main Bassline
4:21 Intro
5:04 Chorus
5:35 Bridge
Here's a TAB play through of the bassline. As a tip you can slow youtube down to 50% or 75% so you can practice it slowly.
/watch/0=pool&AOoW0b4VNigVo
TUNING: I show how to do this in the video with the guitartuna app, but if you have a chromatic tuner, tune the string half way between the each bass note and the next. So the E string is half way between and E and an F, the A string is half way between an A and an A sharp, the D string is halfway between a D and a D sharp and the G string is halfway between a G and a G sharp.