We have spent years researching and looking for repertoire for 2 violins, and studies have always been a big part of this project. Thanks to Alessio Nacuzi we are now closer to have all the important studies available for 2 violins! He has provided the accompaniment to the Kayser and Mazas Etudes that you can download below, along with the rest of what we consider the Foundation Etudes and Caprices for the Violin.
Kayser - 36 Studies Op.20, 2nd violin by Seling
Mazas - Studies Op.36 Book 1, 2nd violin by Grünwald
Mazas - Studies Op.36 Book 2, 2nd violin by Grünwald
Kreutzer - 42 Etudes, 2nd violin by Hermann
Kreutzer - 40 Etudes, 2nd violin by Grünwald
Fiorillo - 36 Caprices, 2nd violin by Leonard
Fiorillo - 36 Caprices, 2nd violin by Spohr
Rode - 24 Caprices, 2nd violin by Leonard
Gaviniès - 24 Matinées, 2nd violin by Marteau
Wieniawski - 8 Caprices Op.18, 2nd violin by the composer
Paganini - 24 Caprices, 2nd violin by Bachmann
There are less popular studies with a 2nd violin accompaniment that can be downloaded for free as well like Campagnoli 7 Diventimenti , Ferdinand David Op.44 , Alard Op.10 , Dancla Op.68 , Dont Op.38 , Rolla Op.10 , Leonard Etudes Harmoniques , etc.
And also, newer editions that can be purchased like Wohlfahrt Op.45 Vol.1 and Mazas Book 1.
Please leave a comment if you know of more Violin Studies with a 2nd violin part that can be added to the list!