Perhaps you should try some spelling variations:
"ballads operas / early works to 1800" » "ballads epigrams / early works to 1800"
"ballads odes / early works to 1800" » "ballads songs / early works to 1800", "ballads glees / early works to 1800", "ballads poems / early works to 1800"

Try widening your search to All Fields.

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: (("ballad operas / early works to 1800") OR ((((("ballads operas / early works to 1800") OR ("ballad opera / early works to 1800"))) OR ("ballads odes / early works to 1800")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"ballad operas / early works to 1800\") or (((((\"ballads operas / early works to 1800\") OR (\"ballad opera / early works to 1800\"))) or (\"ballads odes / early works to 1800\"))))".
• Removing quotes may allow a broader search: (( ballad operas / early works to 1800 ) or ((((( ballads operas / early works to 1800 ) OR ( ballad opera / early works to 1800 ))) or ( ballads odes / early works to 1800 )))).
• Adding a wildcard symbol may retrieve word variants: (("ballad operas / early works to 1800") or ((((("ballads operas / early works to 1800") OR ("ballad opera / early works to 1800"))) or ("ballads odes / early works to 1800"))))*.