2 8 – 2 0 1 5 ): ▁First ▁Quart et ▁( 1 9 5 3 ); ▁String ▁Quart et ▁No . ▁ 2 ▁( 1 9 6 2 ) ▁( 1 9 7 4 ) ▁( re ally ▁a ▁qu int et ▁for ▁wind s ▁and ▁strings ), ▁Third ▁Quart et ▁( 1 9 6 2 ), ▁Four th ▁Quart et . ▁Karl hein z ▁Stock hausen ▁( 1 9 2 8 – 2 0 0 7 ): ▁Hel ik opter - St reich qu art ett ▁( from ▁Mitt wo ch ▁aus ▁L icht ), ▁for ▁string ▁quart et ▁in ▁ 4 ▁hel ic op ters . ▁George ▁Cr umb ▁( born ▁ 1 9 2 9 ): ▁String ▁Quart et , ▁and ▁Black ▁Ang els ▁( Images ▁I ), ▁for ▁electric ▁string ▁quart et . ▁Peter ▁S cul th or pe ▁( 1 9 2 9 – 2 0 1 4 ): ▁E igh teen ▁string ▁quart ets , ▁of ▁which ▁the ▁first ▁five ▁are ▁considered ▁lost , ▁although ▁isolated ▁movements ▁have ▁been ▁performed ▁and ▁recorded ; ▁the ▁tw elf th , ▁four teenth , ▁six teenth , ▁and ▁eigh teenth ▁quart ets ▁include ▁optional ▁parts ▁for ▁did ger id u ; ▁the ▁th ir teenth ▁includes ▁sop rano ▁voice . ▁ ▁Born ▁in ▁the ▁ 1 9 3 0 s ▁Crist ó bal ▁Hal ff ter ▁( b . ▁ 1 9 3 0 ): ▁Seven ▁quart ets ▁Di eter ▁Schne bel ▁( 1 9 3 0 – 2