Fans were desperate for a full collaborative project beyond their few existing tracks together (“Forbidden Fruit,” “Black Friday,” “The Jig Is Up (Dump’d)” – note the latter was a Kendrick verse over a Cole beat). Some bloggers likely renamed a fan mashup or an unrelated instrumental as “J. Cole ft. Kendrick Lamar – Temptation” to drive traffic.
If you're looking to download the song, here are some steps you can take: j cole feat kendrick lamar temptation free mp3 download link
