I see many charts for praise and worship songs charted in sharp keys (A#, F#) major. One song is charted F# Major. I would think the guitars are tuned a half step down and they are playing like it is in G Major. Would it be more appropriate to be in Gb Major? It looks so odd to see so many sharps in pop/rock transcriptions. Looking at cycle of fifths the Gb seems more prevalent then F#. What is the preferred or correct key when the song has guitars a half step down?
When it comes to choosing a key signature, there is no standard. Except that most players are loathe to read music in keys with more than 7 sharps or flats. Aside from a few diehards who insist that F# is a different key than Gb (and it was, before the equal temperament system was developed), one rule of thumb is to use the key most commonly used for the instrumentation, or just to use the key with the least accidentals if there is any doubt.
Since Gb and F# have the same number of accidentals, then you want to consider the conventions for guitar. Since the open strings of the guitar fit into the keys of C, G, D and E major, guitar music is very often written in a key signature with sharps. From this perspective, a guitar player is used to reading in keys with four or five sharps, so adding one or two more may be easier for some guitar players to read than switching the whole key to flats. By this logic, I would probably choose F# over Gb for guitar music, unless there was something in the music itself that would be notated more comfortably in Gb. For instance, if the music has alot of raised notes, that could be difficult to read in F# and I might opt for Gb.
Not sure whether you mean if a tune is in, say, F#, but the guitar is tuned differently, what key should that part be written in. If so,the guitar is in G.
Or, do you mean is Gb a better key than F#.Pretty well as bad/good as each other.But if a piece HAS to be in one of those, it begs the question why? Most songs will not have such a great range of notes (low to high) that they need to be written to within a semitone. So a song in Gb/F# would be just as playable in G or F, both with a far less crowded space after the clef sign.And far less to remember to adjust.
Another reason may be the other instruments in an orchestration. With Eb saxes, or Bb trumpets/clarinets, the original key for them may be easier.Used to play Pretty Woman, written in Ab. Good for the horns, rubbish for guitar - particularly the intro, which had to be played (in standard tuning) almost an octave above the original. Sounded terrible !