Violin where a stopped note sounds a unison or octave with another (open) string, causing it to resonate sympathetically. Students often use these ringing tones to check the intonation of the stopped note by seeing if it is harmonious with the open string. For example, when playing the stopped pitch "A" on the G string, the violinist could play the open D string at the same time, to check the intonation of the stopped "A". If the "A" is in tune, the "A" and the open D string should produce a harmonious perfect fourth. Violins are tuned in perfect fifths, like
Contrabass guitar Contrabass guitar A contrabass guitar is a low-register plucked string instrument in the guitar family with four, five or six strings. It is often called, simply, a "six string bass guitar". The "five string bass guitar" is rarely called a contrabass guitar, even though it typically has the same lowest note. Contrabass guitars have been around since 1899, when a "Grand Concert Contra Bass Guitar" was listed in Joseph Bohmann's catalogue. Bohmann, a violin, mandolin, guitar and zither manufacturer from Chicago, developed a large 6-string guitar. While some logically speculate that this instrument was tuned one octave lower than a