He thought that Ace was "biting" his track and released a diss song toward Ace titled "Just You Wait". Ace responded to Boogieman on the diss track "Acknowledge", which also dissed The High & Mighty over a misunderstanding. The trading of records led to a rap battle between the two at a Lyricist Lounge event. "Acknowledge" was also included on ""Disposable Arts"." Masta Ace can also be found performing numerous "Dubtitled" voice overs on the television series titled "Kung Faux" seen in 150+ countries worldwide. "Disposable Arts" became one of the most acclaimed underground hip hop releases of 2001, beloved for its pure hip hop style and clever album concept, which served as a fictional story, chronicling Ace's time spent at a satirical rap school named the "Institute of Disposable Arts". JCOR Records folded soon after the release, leaving it out-of-print, until being re-released in 2005 on Ace's self-established M3 label. The album closer, "No Regrets", led many fans to believe that it would be Ace's final album, because of the line ""I don't know if it's the end, but yo, it might be"". Ace killed the rumors by returning in 2004 with his fifth album "A Long Hot Summer", another highly acclaimed effort. The story concept, similar to that on his last release, served as a prelude to the story told on "Disposable Arts", chronicling the "Long Hot Summer" that led to his character's incarceration at the beginning of the "Disposable Arts" album. Rumors once again spread about a retirement, which were again squashed, when Ace announced the formation of his new rap crew named eMC, including himself, Punchline, Wordsworth and his protégé Strick. Ace remarked in a December 2006 interview that he would no longer record as a solo artist, only with eMC. eMC's first group album, "The Show", was scheduled for early 2007 but was released in February 2008 digitally and April 2008 physically. In 2007, Masta Ace had a track included on the "Official Joints" mixtape, a compilation of previously unreleased tracks by various NYC rappers. In 2009, Masta Ace joined forces with Boston rapper Ed O.G. to release "Arts & Entertainment" which was released on November 3, 2009. "Arts & Entertainment" got shortened to A&E which resulted in the cable TV channel A&E asking Masta and Edo to remove the symbol from their original album artwork.