sentences:  His contemporary, hymn-writer Christopher Idle, paid tribute to Perry's compositions, his constructive criticism of others' works, and his business acumen in "sorting out what had been a copyright jungle" (referring to critics who expected songwriters to make no charge since their work was "for the Lord").He concluded that few people matched Perry's influence on evangelical praise and worship over the 1970s to '90s.Perry wrote over 300 hymns.