Conversation so far:
What was Ego Trippin'?
He released his ninth studio album, Ego Trippin' .
When was the album released?
CANNOTANSWER.
What did he do in 2007?
In July 2007, Snoop Dogg made history by becoming the first artist to release a track as a ringtone prior to its release as a single.

Question: What track was released as a ringtone?
Self-contained rewrite: What track was released as a ringtone?