I've experienced this more than once: Melot, a tenor role, being sung by a baritone. Today's Bayreuth broadcast is just one of many examples. Melot's highest note is an F#, with a few F's thrown into the mix, which is within the baritone range (Kurwenal, for comparison, has many F's, F#'s, and at least one high G). And, of course, the role is short enough for the tessitura not to be an issue. So it's not too surprising that it _can_ be sung by a baritone, despite being a tenor role; but does anyone know _why_ this practice is so common?