Music Library

Hi,

I purchased several songs long time ago on iTunes that currently appears as "purchased" next to the song. However, the song is missing from my iTunes library. The truth is, I just realized they were missing from my library when I heard the song again and wished to play it on my iPhone. To my surprise, the artist was missing and all the songs I've purchased from that album. I tried to re-purchase it on iTunes but it doesn't seem to give me that option. It just says "purchased".

Please help :)