There are two bands with the name Threshold: a progressive metal band and an R&B band.

1. A progressive metal band from the South of England, consisting of Mac (vocals), Karl Groom (guitar), Richard West (keyboards), Steve Anderson (bass) and Johanne James (drums).

The band's early years saw four highly acclaimed albums released through the independent label GEP. After some line-up changes and many tours in Europe alongside bands such as Dream Theater, Threshold signed to Inside Out Music in 2000.

The albums "Hypothetical" and "Critical Mass" were released in 2001 and 2002, enjoying chart success in Europe while creating a strong reputation with both fans and the music press alike. A live DVD/CD set entitled "Critical Energy" was subsequently released at the beginning of 2004, while Threshold returned to the studio to record their most successful studio album to date, "Subsurface".

In early 2007, founding member Nick Midson (guitar) announced he is taking a break from the band, largely driven by wanting a break from touring and promotional activities.

2007 also sees Threshold signed with Nuclear Blast Records, with it's new album entitled, "Dead Reckoning".

2. An R&B band. Fronted by singer Angela Carole Brown, and led by composer/guitarist Linda Taylor, Threshold includes drummer Laval Belle (Earth, Wind & Fire), bassist Del Atkins (Alicia Keys, Mary J. Blige), organist Mikal Majeed (Rick Zunigar), keyboardist Ed Roth (Coolio, The Brothers Johnson), and singers Catte Adams (Chaka Khan, Natalie Cole) and Janelle Sadler (Natalie Cole, Ozzy Osbourne).