Yes, I know, a very strange question. The sax player should be tuning the guitars, but that is not going to happen. So, that being said, if he's a half step down, E, or a half step up F what relative harmonica keys should I use to conform to the band? Any advice would be greatly appreciated! Thanks, Matt
closed as unclear what you're asking by Richard, MattPutnam, Carl Witthoft, Doktor Mayhem♦ Mar 23 '18 at 10:21
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As it stands, the question isn't clear. Alto sax is tuned to Eb, that is, when the player sees a C, the note that comes out is Eb. Guitars could tune a semitone down, to Eb if needed.
For a straight harp, choose the one in the guitar key, as in, when a song is in A, choose an A harp. Playing cross harp, for A, you will use a D harp.
I suspect the problem is that if the guitars are tuned down, and they play in what they think is A, it will be Ab. So you need a straight harp in An, or cross harp in Db. Better go buy some more harps! The saxist will sort out his own key. All the ones I play with do so.