2000–05: Split Personality and ''I'm a Hustla'' In 2000, Cassidy was a member of the Philadelphia, Pennsylvania-based rap group
Larsiny. Larsiny was discovered in Philadelphia by record producer
Swizz Beatz's father Terrence Dean, and in turn, the group signed to the
Ruff Ryders-subsidiary label TD Entertainment. Their debut commercial appearance was the song "Ryde Or Die Boyz" from the July 2000 album
Ryde or Die Vol. 2. Cassidy co-wrote the single "
Got It All" for fellow Philadelphia rapper
Eve, which was also from the album. In 2002, Cassidy signed a
recording contract with Swizz Beatz's
Full Surface imprint, under the aegis of
Ruff Ryders Entertainment and
J Records. On November 29, 2003, he released his commercial debut single, "
Hotel", featuring
R. Kelly. The song reached the
Top 10 of the U.S.
Billboard Hot 100 chart. The second single, "Get No Better", features
Mashonda. On March 16, 2004, Cassidy released his debut album,
Split Personality. It was
certified gold by the
Recording Industry Association of America (RIAA), the following month. On April 15, 2005, Cassidy released the single "
I'm a Hustla". The next single, "B-Boy Stance", features vocals and production from his mentor,
Swizz Beatz. On June 28, 2005, Cassidy released his second studio album, ''
I'm a Hustla. It debuted at number five on the US Billboard'' 200 chart, with 93,000 copies sold in the first week.
2006–11: B.A.R.S. and C.A.S.H. In 2006, after his release from prison and recovering from an auto wreck, Cassidy began work on his third studio album,
B.A.R.S. The Barry Adrian Reese Story. The album was released on November 6, 2007, debuting at number 10 on the
Billboard 200, with 63,000 copies sold in the first week. The album was led by the single "
My Drink n My 2 Step", featuring vocals and production from
Swizz Beatz. In late 2009, Cassidy signed with
Carmelo Anthony's label
Kross Over Entertainment. While preparing his fourth studio album, he released a mixtape series entitled
Apply Pressure. On August 24, 2010, Cassidy released the five-track EP
Face 2 Face, with the promotional single "Face 2 Face". On November 16, 2010, Cassidy's fourth studio album,
C.A.S.H. (Cass a Straight Hustla) was released. On its first week it had sold about 5,200 copies, much lower than his previous studio albums. "Drumma Bass" was the only official single from the album.
2012–present: Mr. Hip-Hop and Da Science On May 21, 2012, Cassidy hosted a release party for his mixtape
Mayhem Music. On July 8, 2012, he released the mixtape
Mayhem Music: AP3. After fellow Philly rapper
Meek Mill said he would
battle Cassidy, which Cassidy later said he would accept if the money was right. They participated in a "twitter beef" after which Cassidy released "The Diary of a Hustla" which was originally thought to be a diss towards Meek. This was later refuted by Cassidy. They both were asking for $100,000 each for the battle to take place. However, after Meek Mill dissed Cassidy's song "Condom Style" (a remake of
Psy's "
Gangnam Style") Cassidy released a song titled "Me, Myself & iPhone" where he took shots at Meek Mill. Afterwards, Meek Mill responded with the diss track "Repo" which Mill later said would be the final diss record he would release against Cassidy. Cassidy later said the feud was not personal, saying it was all in the spirit of hip hop. On January 6, 2013, Cassidy released a 10-minute-long diss response titled "Raid". On October 6, Cassidy released his album Da Science. In April 2025, Cassidy released the single "I Ain't See Nothin'". ==Other ventures==