Chief Keef teams up with his former Chicago rival Lil Durk for the Young Chop-produced "Decline." Their first collaboration in a few years, Keef takes on the hook, singing about declining phone calls from persistent women and adding a verse in between Durk's own two verses.

"I'm rollin she callin she stalkin / My phone and I don't answer / I keep declinin' / She keep whinin on my lyin' and / I'm like go, I'm on the road / I'm fuckin hoes hoes I'm coutin rolls / And you know how it glo / With the glo we get dough," Keef sings in his signature Auto-tune on the hook.

"Decline" follows two tracks that Keef dropped last week, "Hiding" and "Voodoo." 2015 is shaping up to be another productive year for the Chicago rapper who also had a very prolific 2014.

Last year, Keef released a full-length album Nobody along with a number of mixtapes despite being dropped by his label Interscope. His next mixtape Thot Breaker is set to drop on Valentine's Day, while a joint album with his cousin Fredo Santana titled Blood Thicker Than Water is set to drop at some point during the year. Even his long-awaited Bang 3 album, which was scheduled for release at least a few times last year, could possibly drop at some point this year.

Keef is also rumored to be collaborating with Drake this year, as the two have been cryptically communicating through Instagram about a possible project titled GLOVO — combining the names of Keef's label Glo Gang and Drake's label OVO Sound.

Meanwhile, Durk is on the road with Villain$ and H Scott for the "Everywhere I Go Tour."

Check out their "Decline" collaboration below, and let us know what you think in the comments section!

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