As a guitarist I used to wonder what these bassists were up to with five strings and Drop-D levers, then when I embarked on my own bass clef odyssey I learned off the bat that 4 out of the 5 songs that inspired me to play bass invoked the low-B.
First song I wrote- the bass line invoked the Low B on occasion. The second song I wrote - the main riff begged for an octave drop after the final note of the riff - a D on the fifth fret of the A string which the octave below was two frets shy. Also made the following ascending triad progression a lot easier to play-
So in 2009 I special-ordered a Warwick Corvette unlined fretless five- I hate fret lines and markers, they confuse me- - because nothing like that was readily available at the time. Then after watching a Leland Sklar interview where he sang the praises of the Hipshot Xtender, I eventually ordered three, one of which is installed on my G2 T- Bird.
Necessity is the mother of invention - fortunately for me, miy needs had already been invented-
But I steer away from arcane tumings - too confusing - I'm challenged enough with standard and Drop- D. Although I occasionally tune to Eb to learn and practice Robin Trowe songs,
But I hate relegating instruments to specific tunings because I love them all and want to use them for any song-