The troubadours of the movement, not to be confused with the Occitan troubadours (who frequented courts in nearby León and Castile), wrote almost entirely cantigas (although there were several kinds of cantiga) with, apparently, monophonic melodies (only fourteen melodies have survived, in the Pergaminho Vindel and the Pergaminho Sharrer, the latter badly damaged during restoration by Portuguese authorities).
It is recorded that in 1298 he composed a monophonic office for the royal palace chapel at Paris, and that in 1301-2, he resided at the court of the Bishop of Amiens, undoubtedly as a member of his clerical staff, and most likely his chapel staff as well.
Besides trouvère monophony, Karp has written articles on the polyphony of the schools of Saint Martial's, Santiago de Compostela, and Notre Dame.