Sorry for the thread resurrection but this thread was namechecked in the Versatile Stingrays thread so I thought, "Why the heck not join in"...
For my most versatile I would name-check my Mark 1 Wal 4 String. Some folks think of Wal as just sounding like 80s Geddy or BSSM Flea or just like Justin (all of which they do) but they have so much broader a tonal palette than that. I've played so many genres (folk to pop, rock n roll to heavy rock, funk to jazz, nu-soul to reggae, worship to function bands) with this bass and it has always had a whole range of sounds which were easy to find and sat beautifully in the mix.
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