Assertion: hornpipe | /r/HasProperty | performed by professional musicians
Facets:
value: in 'difficult' keys
type: OTHER
value: often
type: TEMPORAL
Source sentences:
text: In those environments it often morphed into the popular 'music hall' entertainments of the working classes and was often performed by professional musicians, often in 'difficult' keys and incorporated quite sophisticated chordal structures, maybe borrowed from the professional 'Tin Pan Alley' composers of the day and adopting American influences also.