What is 'debut long player'?

Hi. I've seen 'debut long player' in the artivels about razorlight that is a good brit-pop band.. but I haven't found the meaning in the dictionary..
If you know the answer , please help me..
And i hope it's not trivial vocabulary question...
Anyway thank you for reading.

"debut" means "first".

"long player" refers to an LP (long-playing) album.

http://en.wikipedia.org/wiki/LP_album

Thank you so much for your answer...