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Tracks:

• Str Qt in Four Parts: Quietly Flowing Along
• Str Qt in Four Parts: Slowly Rocking
• Str Qt in Four Parts: Nearly Stationary
• Str Qt in Four Parts: Quodlibet
• 'Four': Part One
• 'Four': Part Two

Tracks:

• 30 Stücke für Streichquartett (1983) - Arditti Quartet,Cage,Ullmann,J.
• Komposition für Streichquartett Nr. 2 (1998/1999) - Arditti Quartet,Cage,Ullmann,J.

Tracks:

• String Quartet: The Tree of Strings
• 9 Movements for String Quartet - Fantasia 1
• 9 Movements for String Quartet - Frieze 1
• 9 Movements for String Quartet - Fantasia 2
• 9 Movements for String Quartet - Fantasia 3
• 9 Movements for String Quartet - Frieze 2
• 9 Movements for String Quartet - Fantasia 4
• 9 Movements for String Quartet - Frieze 3
• 9 Movements for String Quartet - Fantasia 5
• 9 Movements for String Quartet - Todesfuge - Frieze 4

Tracks:

• III. Prestissimo
• C measure = 92
• Study for Player Piano Nr. 15
• Study for Player Piano Nr. 31
• Study for Player Piano Nr. 33
• Study for Player Piano Nr. 34
• Toccata für Violine und Player Piano
• C measure = 92

Tracks:

• Metamorphoses nocturnes
• Allegro nervoso
• Sostenuto, molto calmo
• Come un neccanismo di precisione
• Presto furioso, brutale, tumultoso
• Allegro con delicatezza

Tracks:

• Streichquartett Nr. 3 "Grido" - Arditti Quartet,Lachenmann,Helmut
• Streichquartett Nr. 2 "Reigen seliger Geister" - Arditti Quartet,Lachenmann,Helmut
• Gran Torso - Arditti Quartet,Lachenmann,Helmut

Tracks:

Disk 1

• Quartett V
• Quartett IV
• Quartett III: I
• Quartett III: II
• Quartett III: III
• Quartett III: IV

Disk 2

• Quartett II (Time Zone): Zone 1
• Quartett II (Time Zone): Zone 2
• Quartett II (Time Zone): Zone 3
• Quartett II (Time Zone): Zone 4
• Quartett II (Time Zone): Zone 5
• Quartett II (Time Zone): Zone 6
• Quartett II (Time Zone): Zone 7
• Quartett II (Time Zone): Zone 8
• Quartett II (Time Zone): Zone 9
• Quartett II (Time Zone): Zone 10
• Quartett II (Time Zone): Zone 11
• Quartett II (Time Zone): Zone 12
• Quartett II (Time Zone): Zone 13
• Quartett II (Time Zone): Zone 14
• Quartett II (Time Zone): Zone 15
• Quartett II (Time Zone): Zone 16
• Quartett II (Time Zone): Zone 17
• Quartett II (Time Zone): Zone 18
• Quartett II (Time Zone): Zone 19
• Quartett II (Time Zone): Zone 20
• Quartett II (Time Zone): Zone 21
• Quartett II (Time Zone): Zone 22
• Quartett II (Time Zone): Zone 23
• Quartett II (Time Zone): Zone 24
• Quartett I: I
• Quartett I: II
• Quartett I: III
• Trio (Musique fugitive)

Tracks:

Disk 1

• Streichquartett Nr. 1 (1977)
• Streichquartett Nr. 2 (1988)
• Streichquartett Nr. 3 (1995)

Disk 2

• Streichtrio (2004)
• Streichquartett Nr. 4 (2003)