ONE MISTAKE IN MY IPOD

Today I left my Ipod connected to my computer, but by one mistake I pressed to synchronise it with the actual library and my old songs was erased completely. It was so sad because I don't have back up of those songs, so I have to collect them again to complete my music preference. I'm so sad about it because too much music that I love was deleted. Maybe in the future I have to be more careful.