In voicing jazz chords while in a group setting, performers focus first on the seventh and the major or minor third of the chord, with the latter indicating the chord quality, along with added chord extensions (e.g., ninths, elevenths, or thirteenths, even if not indicated in the lead sheet or fake book) to add tone "colour" to the chord. As such, a jazz guitarist or jazz piano player might "voice" a printed G7 chord with the notes B–E–F–A, which would be the third, sixth (thirteenth), flat seventh, and ninth of the chord. Jazz chord-playing musicians may also add altered chord tones (e.g., 9, 9, 11, 13) and added tones. An example of an altered dominant chord in the key of C, built on a G would be to voice the chord as "B–C–E–F–A"; this would be G7(911).