Hi my question is what types of tuning are most popular with bass guitars? I understand natural because that's how they usually come from the manufacturer or I should say that's how I tune them when they come from the manufacturer. Lately I have noticed in some songbooks a lot of songs are not played in natural tuning. They use a drop D tuning which I understand as the E string being taken down a half a step no that's halfstep tuning. Are there basic rules for tuning a bass guitar when you are not in natural tuning? I am not adept enough to be able to retune my bass guitar from song to song in a set list. Would someone be able to tell me the various types of tuning that bass guitarists use and why I am very interested to know this. Thank you very much for reading my thread hope you have a happy new year thank you again, Mark.