Simplify the following text for a Grade 7 native English-speaking person.
Original: He wrote five books of PiÃ ces de viole ( 1686-1725 ) for the instrument , generally suites with basso continuo .
Simplified: He wrote five books of PiÃ ces de viole ( 1686-1725 ) . Most of the pieces in the book are suites with basso continuo .