Stylised object is referred to in line 5. It is the instrument.
No 4 is from the same era as no 1, since there is no E at the end of his name. His first name was Allan. No 5 is contemporary, he toured England this year. No 3 might be one of 2, neither English and both world-renowned. No 2 might be one of 2, both English. And John was a no 2.