Strong bass lines are the raison d'ëtre for Led Zeppelin. This is extremely driving with some non-Zep key changes.

It seems that there is simply no end to the strong bass lines that Led Zeppelin came up with. If you think that a small feat - try looking elsewhere for an equivalent track record. This is pretty straight forward save a few non-original key changes. Keep the string bends real tight - quarter tones should suffice, and observe the dynamics and accents.