Steps that I would use to get started...
1. 2. Summon Broad search to see if the topic is viable - discovery!
3. OBIS for Books and Scores
4. Naxos Music Library for sound files
5. Scholarly Articles in music databases and/or Summon
6. Newspaper articles in Summon and/or newspaper databases
Galina Ustvolskaya (shown here in the early 1950s)
A page from the manuscript for Ustvolskaya’s Symphony No. 2.Credit...Paul Sacher Foundation, Basel