In practice, many fake books do not specify all the alterations; the chord is typically just labelled as G7alt, and the alteration of 9ths, 11ths, 13ths, and 15ths is left to the artistic discretion of the comping musician. The use of chords labeled G7alt can create challenges in jazz ensembles where more than one chordal instrument are playing chords (e.g., a large band with an electric guitar, piano, vibes, and/or a Hammond organ), because the guitarist might interpret a G7alt chord as containing a 9 and 11, whereas the organ player may interpret the same chord as containing a 9 and a 13, resulting in every tone from the altered scale at once, likely a far denser and more dissonant harmonic cluster than the composer intended. To deal with this issue, bands with more than one chordal instrument may work out the alt chord voicings beforehand or alternate playing of choruses.