<Tr> <Td> 2 . </Td> <Td> "Harry's Wondrous World" </Td> <Td> 5: 21 </Td> </Tr> <Tr> <Td> 3 . </Td> <Td> "The Arrival of Baby Harry" </Td> <Td> 4: 25 </Td> </Tr> <Tr> <Td> 4 . </Td> <Td> "Letters from Hogwarts" </Td> <Td> 3: 23 </Td> </Tr> <Tr> <Td> 5 . </Td> <Td> "Diagon Alley and the Gringotts Vault" </Td> <Td> 4: 06 </Td> </Tr>

What is the main theme of harry potter and the sorcerer's stone