[quote name='MoJo' timestamp='1470324692' post='3105162']
Two thirds of the set is in concert pitch, the other third, half a step down. We used to play everything half a step down and my four stringer was set up tuned to Eb. The band think that a lot of the songs sound better in concert pitch, but the DC and Lizzy stuff sounds better half a step down. The choices are two differently tuned basses, retune between songs (I've been doing this at rehearsals and can retune quicker than the guitarists can change their guitars) or try the five string option
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This was pretty much why I took up 5 string in the first place, and rarely pick up a 4 now. If I tried to play a downtuned song on a 4 string now, I'd probably have a fit!