Rob Gregoire has 7 Loudness concerts.

Loudness is a Japanese heavy metal band formed in 1981 by guitarist Akira Takasaki and drummer Munetaka Higuchi. They were the first Japanese heavy metal act signed to a major label in the United States, releasing twenty-three studio albums (five in America) by the end of 2009 and reaching the Billboard Top 100 in their moment of maximum international popularity. Despite numerous changes in their roster, the band continued their activities during the 90's, finally reuniting the original line-up in 2000.