Technically Manowar’s 139 Dbs was during a soundcheck in 2008 and not an actual concert. KISS allegedly hit 136 dbs at a concert in Ottawa in 2009.

After that it goes Leftfield (135 dbs in 1996), Motörhead (130 in 1986 but unconfirmed), and then Manowar again at 129.5 dbs in 1994.

But most of this is difficult to rank today because record keepers like Guinness don’t accept attempts for this record anymore because it’s dangerous to human hearing.