Conversation so far:
How were Drake's early mix tapes distributed?
Drake self-released his debut mixtape, Room for Improvement, in 2006.
How many copies sold?
The mixtape was released for sale only, and confirmed to have sold over 6,000 copies.
When did he create his next mix tape?
In 2007, he released his second mixtape, Comeback Season.
Did it sell better than his first tape?
The song made Drake become the first ever unsigned Canadian rapper to have his music video featured on BET.
Which single was featured on BET before he was signed with a label?
"Replacement Girl".

Question: When did he sign with a label?
Self-contained rewrite: When did Drake sign with a label?