Mandolin-banjo became more popular. In the heyday of mandolin orchestras and banjo bands (late 19th–early 20th century), all sorts of instruments were produced. The mandolin-banjo is one of the hybrids that resulted. It enabled mandolinists to produce a banjo sound without having to learn that instrument's fingerings. The instrument adds the banjo's volume to the mandolin. The banjolin is different from the banjo-mandolin in the number of strings that it has. Banjolins today are supposed to have four strings instead of 8 strings (in courses or pairs). However, that distinction is not universal; the "banjolin" name was patented in 1885 by
Bluegrass mandolin in these bands took elements of Monroe's style and then added their own flavor. Mandolins come in many shapes and sizes, but most are not suitable for bluegrass playing. Old traditional mandolins with round backs, for example, are difficult to play in a standing position, and are almost never used. Some older mandolins have relatively few frets, limiting the mandolin player's use of high notes. Most bluegrass mandolin players choose one of two styles. Both have flat or nearly flat backs and arched tops. The so-called a-style mandolin has a teardrop shaped body; the f-style mandolin is more stylized, with