B Tuning or B Standard Tuning is the standard tuning for a seven string guitar, where the strings are tuned B-E-A-D-G-B-E. B tuning can also be achieved on a six-string guitar, when the strings are tuned B-E-A-D-F♯-B, known then as Baritone Tuning. This tuning is popular among several different types of metal bands.
Some bands use a tuning known as "drop A tuning", where they drop the low B to A, so the tuning for a 7-string guitar is as follows A1-E2-A2-D3-G3-B3-E4. Also, for a 6-string guitar, drop A tuning is achieved by tuning all strings down a 4th with the lowest string tuned 1 additional step down as follows A1-E2-A2-D3-F#3-B3. This is a "drop 1" tuning in the key of B (i.e. tune the whole guitar down a perfect fourth from standard tuning, then tune the 6th string a whole step down).
Linkin Park (BEADGB. Used on live performances of the songs "Runaway" and "With You" from 2003 onwards; originally recorded on standard tuned 7-string guitars)
Spawn of Possession (6- & 7-string guitars; Jonas Bryssling plays a 6 string, while Jonas Karlsson and Christian Muenzner's parts are written for 7 strings)
