There are multiple artists named M.S.B.:

1) M.S.B. aka Mafia Style Ballerz is a gangsta rap act from Nashville, Tennessee, United States. Released "Underground Chronicles" in 1997 on Propalyke Records, featuring appearances by Big Ice, Lil Penn, Snook, Kay-O and more.

2) M.S.B. aka Most Significant Beat is an electro-industrial project from Rome, Italy, founded in 1991 by Saverio Evangelista (Esplendor Geométrico) and Maurizio Martinucci (Tez). Their music is based on rhythms and electronic sounds, sometimes purely industrial, other times closer to ambient techno, with a style slightly less noisy than Esplendor Geométrico, and reminiscent of the cyberpunk band Clock DVA.
M.S.B. members continue playing with their solo careers: Martinucci Maurizio is now focused on an ambitious audio-visual project named Optofónica, and collaborating with experimental electronic musicians such as Frank Bretschneider, Francisco López and Scanner. Saverio Evangelista released a solo album titled "Works 2001-03", a collaborative album with industrial pioneer Maurizio Bianchi titled "Micromal Sonorities", and keeps collaborating with Esplendor Geométrico. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.