I'm making a lead sheet of the song "One" by Esperanza Spalding.
I chose the key of Bb because the song feels the most "at home" when the progression lands there at the guitar solo after the 3rd chorus. You could alternatively say it's in Db, which is the first chord of the verse each time. I'd like to hear which one people think it is.
Whichever you choose, the problem of Cb arises (chord bII in Bb or bVII in Db) during the guitar solo. I imagine players would rather just see "B" on the lead sheet, but I'll be expanding this lead sheet to a full arrangement afterwards, and I don't want to deal with the resulting accidentals when I'm writing the full charts.
So it occurred to me that I could just rewrite the whole thing in A#(or C#). But three double-sharps doesn't sound fun.
I don't think writing "Cb" on a lead sheet (especially this one) is so terrible but I'd like to hear what other people think before I commit to it.