There are four PSG's:
PSG is a hip hop trio unit, Itabashi-ku, Tokyo. Consist PUNPEE, S.L.A.C.K. & GAPPER.
PSG is a Breton acoustic guitar trio consisting of Patrice Marzin, Soïg Sibéril and Jean-Charles Guichen. A former member is Jacques Pellen. See also: Marzin Sibéril Guichen
There's also Finnish alternative rock band called PSG. http://www.myspace.com/psgbandfin
Furthermore, there is one Japanese group of this name. The group describes its sounds as dark, deep and calls it "All Downer…
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