This series consists of programs and announcements of Sonde events, in event number order.

This series consists of programs of festivals Sonde participated in.

This series consists of audio recordings of Sonde music.

This series consists of scores/instructions for Sonde musical pieces.

This series consists of paper media clippings of events.

This series consists of programs from conferences Charles de Mestral attended.

Paul Helmer’s "Growing with Canada" Collection constitutes an important resource for research in Canadian music and culture of the twentieth century. Canadian music and culture of the twentieth century. The Collection has been divided into seven series and contains approximately 1 140 items. Of particular interest are the edited interview transcripts (S.1 and S.7, available in print and .pdf, respectively), which Dr. Helmer had intended Paul Helmer Finding Aid Page 3 of 18 17 July 2014 as the second volume of his project. The Collection also contains the raw material for these edited transcripts: namely, the unedited transcripts and audio recordings themselves, as well as biographical information for each “émigré” musician discussed (with correspondence, copies of source material and photographs), copies of primary and secondary sources on immigration and internment, and miscellaneous items, including correspondence, unused research materials and notes relating to the book launch for "Growing with Canada".

This series consists of unused research materials, documents pertaining to the Growing with Canada book launch and a related lecture, a copy of Dr. Helmer’s monograph, and other miscellaneous documents. The series contains 44 items.

This series contains audio recordings of twenty interviews conducted by Dr. Helmer as well as music of George Adams. The series consists of 22 compact discs and 4 cassette tapes, for a total of 26 items.