Perhaps you should try some spelling variations:
"integrating theory of tonal music" » "integrated theory of tonal music", "integrating theory of choral music", "integrating theory of formal music"
"integration theory of vocal music" » "integration theory of local music", "integration theory of focal music"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("integrating theory of tonal music") OR ("integration theory of vocal music")).
• Removing quotes may allow a broader search: (( integrating theory of tonal music ) or ( integration theory of vocal music )).
• Adding a wildcard symbol may retrieve word variants: (("integrating theory of tonal music") or ("integration theory of vocal music"))*.