List of quarter tone pieces
Wikimedia list article

A selection of compositions using quarter tones:
A
Thomas Adès
Asyla calls for an upright piano tuned a quarter-tone flat.
B
Jan Bach
Concert Variations for solo euphonium; "each variation is based on different performance techniques of the instrument, including quarter-tones"
János Bali
Aiolos ajándéka (Gift of Aiolos) for violin, viola da gamba (tuned 1/4 tone lower), harpsichord (upper manual tuned 1/4 tone lower)
Clarence Barlow
Çoǧluotobüsişletmesi for four pianos. "in which four of the 12 pitches of the chromatic scale are tuned a quarter tone flat"
...until' version 7 for guitar (1980).
Hans Barth
Concerto for Quarter Tone Piano and Quarter Tone Strings (1930)
Béla Bartók
String Quartet No. 6; the third movement Burletta contains quarter-tone tuning used for parodistic effect. Quarter tones are also used in Bartók's ballet The Miraculous Mandarin.
Sonata for Solo Violin; the fourth movement Presto contains quarter-tones, but they are not "structural features." This movement also calls for third-tones.
Violin Concerto No. 2; the cadenza in the first movement requires the use of quarter-tones, but only as an effect.
John Beckwith
Blurred Lines for violin and harpsichord (1997)
Jack Behrens
Quarter-Tone Quartet, Op.
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