The compositions mentioned below are declared to have a key with seven accidents which is not confirmed yet.

Composer Opus
Ludwig van Beethoven
Waltz in C sharp major for piano
WoO 16 #1
Justin E. A. Busch
String Quartet #7 in A-sharp minor
Suite #3, in C-sharp major for solo Viola Pomposa
Ignacio Cervantes
Vuelta a hogar in A-flat minor
Herbert Collum
Concert No. 2 for Harpsichord and Strings in C sharp major
Ferdinand Ries
Piano Quintet in B minor op. 74
Modulations as far as A-flat minor.
Robert Schumann
Waltz in A flat minor for piano
Harold Shapero
3 Studies in Cis (1969) for piano & synthesizer
Bedrich Smetana
Characteristic piece in C-flat major for piano (not op. 1 Nr. 2!)