Instrumental Duet Flute,Guitar,Instrumental Duet - Level 3 - Digital Download SKU: A0.963121 Composed by Matheus Viana. Jazz,Latin. Score and parts. 2 pages. Matheus Viana #5981807. Published by Matheus Viana (A0.963121). This composition has been made during the quarentine, it's about a conversation with a friend of mine about the book Sophie's World, by Jostein Gaarder. Pedro, my friend, gave me this book as a gift and it was really important to me as an introduction to philosophy and sociology. .