Tunings such as"BEAD"(this requires a low"B" string in addition to the other three"standard" strings),"D-A-D-G"(a"standard" set of strings,
with only the lowest string Detuned), and D-G-C-F or C-G-C-F(a"standard" set of strings,
all of which are Detuned) give bassists an extended lower range.