Sentence 1: I wanted to learn more about Medieval music. 
 Sentence 3: I saw some pictures of old instruments 
 Sentence 4:  Many were unfamiliar, but some were recognizable 
 Sentence 5:  I bought a flute similar to those I had seen, and started learning it 
 Option 1: I asked my teacher about it. 
 Option 2: I did some research at the library.