Name: Cassidy

Mixtape: Best of Cassidy

Hometown: Philadelphia

Joints to check for: "What It Is" featuring Yung Wun, "Tic Toc" and "Full Surface Anthem."

Previous mixtapes: None

The 411: If the party anthem "Hotel" with R. Kelly was your introduction to Cassidy, you may be have been a little misled. Swizz Beatz's prodigy is far from your typical man-about-town playboy rapper. The young boi from Philly is one of the nastiest spitters, either veteran or new jack. He must be -- Cass already has a Best Of mixtape and he hasn't released his debut LP yet, so you know he's been putting in work.

DJ On Point has assembled some of Cass' most spine-tingling lyrical highlights from various freestyles and unreleased underground headsplitters like the ferocious, fire-filled "The Problem," which is his nickname.

Meanwhile, DJ Big Mike has been a handful in his own right, keeping his peers on their toes with his feverishly copped street releases. Mike just put out the eighth installment of his R&B Jumpoff series with a smattering of hip-hop- and R&B-flavored selections by the likes of Kanye West, B2K and the man who dubbed himself Mr. Entertainment.

Usher teams up with fellow ATL kings Lil Jon and Ludacris on "Yeah." "Urrshurr," as Luda calls him, sings about not wanting to leave a party because a girl has caught his attention. Cris raps that grabbing eyes on the dance floor is not enough for his dream girl, he wants a freak in the bed. Meanwhile, Mike also includes a dream-team collaboration of R. Kelly and Jennifer Lopez with the remix of "Baby I Love You."

"It's like downtown New York in the middle of traffic jams, all I really want you to know is who I am," Kelly croons. "Find me low-key in the back of the club or with some fine females rolling on dubs." The Pied Piper also brags about big pimpin' on a shopping spree with his homey J. Lo in Los Angeles.

Maybe while out in Cali, Kells from Chitown and Jenny from the Block might stop off to chill with everyone's favorite permed-hair slang master. Snoop Dogg carries on his own mixtape series with Welcome to the Chuuch Vol. 4: Sunday School. Also holding it down for the west is DJ Wats with 99 Problems (But Your Tape Ain't One). DJ Whoo Kid holds it down for almost all other areas with SWAT. 50 Cent's personal record spinner features freestyles by Jay-Z, the Youngbloodz and the newest member of the G-Unit, Game.

For other artists featured in Mixtape Mondays, check out Mixtape Mondays Headlines.