This is ment to be a start for flatwound conversation and a thread for flat users like me, so you are free to speak everything even remotely related to flats - but also you roundwound users are welcome to participate! The title is taken from a flatwound article BP did couple years back, titled 'That flatwound thud keeps coming back!', if I recall correctly. Does it, really? The BP reported then that a worker of bass-only store had been "noticing that more younger guys are coming in asking for flats, so we've been stocking them more". Originally flats were THE bass string, I think Rotosound came out with first commercial sets of rounds a decade after first Fender basses or something like that, but James Jamerson, Duck Dunn and pretty much most of the "old school" players used flats through 60s or their whole career. Then, it seems, rounds took over sometime during the next decades - it certainly was standard string when I begun my playing in mid 90s - and for some reason, flats were almost forgotten. As an example of this, few years back I went to local music store to ask flats for my 5-string. The older, experienced salesman was taken by surprise: "Flats? For a five-string? I think we had one set for a four-string once, and I think that's pretty good from our part.." - closest I did finding flats was a set of D'Addario Halfrounds from another store. Nowadays, I certainly have been impressed with flats - the Rotosound 77's I've been using a while have been becoming an essential part of 'my tone', and then there's the factor of rounds dying out on you, no thanks, no more buying a new set once in two months. How do you feel about flats, then? Do speak your mind!