Here’s a video showing how to play bass to Roadhouse Blues by The Doors.
The original bass part was played by a bass player and not by Ray Manzarek on keyboard bass. But the line is pretty simple and great for beginners.
If you’re not registered for the free members area featuring song tutorials, sight reading etudes and more…here’s where to do it: https://how-to-play-bass.com/register/free-bass-lessons1
If you’re a bass beginner….check out the only 6 things you should be practicing: https://how-to-play-bass.com/htpb50-6-things-practice
….and how you can too!
More here: https://how-to-play-bass.com/mccartney-bass