Bruno Mars’ bassist my target tone, such warm tone and I really love it. You mentioned he plays flats, I used to wonder if it’s hard to play fast and do funky stuff with flats, guess not.
just consider that most "funk" you hear is still played with flats, and the sound until the 80's was flatwound's.
I never understood the topic about flats harder to play: yes, they are a bit tighter than the "same" rounds, but this allows a lower setup with almost zero buzz.
My jazz strung with 52-110 has the lowest action possible, and I used to have the same strings on a Stingray and a Precision Bass (plus a Thunderbird, but just for a few days), and the action was the lowest I could, so my left hand didn't have any issue.
also, a tighter string allows more dynamics, a wider dynamic range with the right hand, less fatigue when playing harder, because the string stays firm and doesn't bend under the finger.
I can fly on the fretboard with 52-110 flats, I can't with 45-100 rounds.
also, a 50-105 set of Ernie Ball Slinky (nickel rounds) has more tension than the Labella Jamerson 52-110 set; I can say that because siwtching from EB's to Labella I had to loose the truss rod, and not tighten it, on three different basses.


