Jazz
In jazz, the guitarist's lines tend to be heavily built off of chords, which provides a more melodic, unified feel to the notes played. The late Wes Montgomery, a guitarist who exemplified this approach to the instrument, is pictured above. While relatively simple in his style compared to other jazz greats such as Joe Pass, or George Van Eps, he still displayed a staggeringly vocabulary of large of chords and voicings, and at times even comped with himself.
Playing this style of music is very technically demanding at times, which is benefcial to any guitarist for the fact that it will make (s)he a better player. The constant chord and key changes, fast single-note lines, and negligible room for error will push nearly any guitarist to succeed, be it in the home or on the stage.
An abysmally deep look into the science of harmony is also realised through jazz. Each song is the culmination of moving bass lines, surging drums, expertly played guitar and piano, and sometimes even breathy brass or wood instuments all working together through key changes, weaving in and out of one another to make a statement, a song.