F# at the Guitar Seat
62 qualities under one letter. Pick the one the chart actually wrote.
Everything a chart can write over the letter F#, in 10 families. Four or five of them carry most of the repertoire; the rest are what a reharmonisation reaches for when four or five stop being enough.
The guitar seat carries the comp — the changes stated in three and four notes behind whoever is playing the melody, which in practice means dropping the root and playing the notes nobody else is covering — the third and the seventh first, everything else only if it fits under the hand.