Free-bass system

[9] In the United States, the virtuoso John Serry Sr. designed and built a working model of a free-bass system to assist in the performance of both classical and symphonic jazz compositions in 1940.

In Northern Europe, free-bass accordionist Mogens Ellegaard, along with Hugo Noth and Joseph Macerollo,[13][14] helped popularize the instrument and inspire compositions for it.

[notes 2] In an interview he describes how the free-bass accordion was still practically non-existent in his childhood (born 1935), but how composers in his native Denmark began to write works for him since 1958.

In some Russian, Canadian[16] and European music conservatoires, free bass accordion is considered a serious instrument for study and there is now a large modern repertoire for it.

In Canada, the accordionist Joseph Macerollo even collaborated on the development of a detailed syllabus for students of the Free-bass accordion while on the faculty of the Royal Conservatory of Music Toronto (RCMT) in the mid 20th century.