This is volume one of the Harper Hall Trilogy. I love these books! My grandfather used to read them and actually got me hooked on the dragon books at an early age of 11. I haven't read them in so long this book was brand new to me.
Dragonsong is about a world called Pern. There is a whole society there with customs and creatures...also humans live there. A planet or star orbits close to Pern and drops dangerous silver Thread, a micro-organism of some sort that eats everything it touches. There are also large Dragons on the land that humans can impress to be kind of like soul mates with, or best friends, they can talk to each other through thoughts...anyway the Dragons can burn up the Thread with their firey breath. They fight it off so it doesn't fall on the people below and ruin everything.
A girl lives in one of the Halls and she loves music. Unfortunately traditionally only boys can be good at music. Her family is embarrassed that she is so musically talented...anyway without giving it all away she ends up making friends with smaller dragons called fire lizards and she teaches them to sing. She has such an intriguing story it was hard to put this book down. Plus if you have ever read any of the Pern books they are so addictive you can't get enough of it's fascinating dragon lore. I love science fantasy books!