In addition to composing, Soper performs frequently as a new music soprano in her own works and the works of others, and many of her vocal works were developed with herself in mind as performer. Her compositional style has been deemed "exquisitely quirky" [3] with "seamless commingling of not only lines but of actual instrumentation and fingering with another player."[4]
Recent commissions for work as a performer/composer include a 2012 Guggenheim fellowship for a one-act opera with original libretto, Here Be Sirens; a Koussevitsky Commission for a music theatre work performed with Alarm Will Sound; and now is forever for soprano and orchestra from the American Composers Orchestra.[5][6][7]
Since 2006, Soper has served as a co-director and vocalist for Wet Ink, a New York-based new music ensemble founded in 1998 and dedicated to the presentation of programs of new music, with a focus on creating, promoting, and organizing American music. In addition to a New York concert season featuring many of the city's freelancers, Wet Ink performs as a septet consisting of a core group of composer-performers that collaborate in a band-like fashion, writing, improvising, preparing, and touring pieces together over long stretches of time. Alongside fellow composer/directors Alex Mincek (saxophone/founding member), Sam Pluta (electronics), Eric Wubbels (piano), and performers Ian Antonio (percussion), Erin Lesser (founding member, flute), and Josh Modney (violin), Soper frequently tours, performs with, and writes for the Wet Ink Ensemble. Her large-scale monodrama for the group, Voices from the Killing Jar, was released on Carrier Records in 2014.[8][5]
Voices from the Killing Jar (voice, flute, sax/clarinet, piano, violin/trumpet, piano, electronics), 2010–12
Helen Enfettered (soprano, mezzo-soprano, clarinet, trumpet, piano, violin, viola, cello, contrabass), 2009, a setting of the "e" chapter of Christian Bök's Eunoia.[16][14]
Door (voice, flute, saxophone, electric guitar, accordion), 2007
Songs for Nobody (two sopranos and alto), 2006
What you think of in the city (baritone, viola, cello), 2002
Ipsa Dixit (voice, violin, flute, percussion), 2016[17]
Entre les Calanques (orchestra; original chamber version with flute, cello, bassoon, two horns, three violins, three violas, two cellos, two contrabasses), 2010
Nine Rakes (wind orchestra), 2007
The door in the wall (flute, oboe, two clarinets, bassoon, horn, trumpet, tn, piano, two percussionist, two violins, viola, cello, contrabass), 2011, revised 2012
What makes it go (flute, oboe, two clarinets, bassoon, horn, trumpet, tn, piano, percussion, two violins, viola, cello, contrabass; original version with three violins, three violas, three cellos, three contrabasses) 2010, original version 2008
As the Crow Flies (flute, clarinet, two saxophones, horn, trumpet, trombone, electric guitar, accordion, piccolo, violin, viola, cello, contrabass), 2007