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This term refers to any kind of singing that is done sans instruments. It is an Italian term that literally means "in the manner of the chapel".
A distinctly American style of the above done in four part close harmony quartets and choruses. It originated in the early 20th century and can sometimes sound old-fashioned today.
This term was originally used derisively primarily for male singers whose sentimental style was made possible by the use of microphones. Practitioners include Rudy Vallee, Bing Crosby, Andy Williams, Nat King Cole and Dean Martin.
This term is used to describe unaccompanied monophonic sacred singing of the Catholic church from 9th and 10th century Europe. In the 1990s an album of such singing by the Benedictine Monks of Santo Domingo de Silos reached #3 in the Billboard Pop charts.
This style of singing is used in jazz and occasionally for humorous effect is improvised with nonsense words and syllables. Some of it's practitioners include Ella Fitzgerald, Louis Armstrong, Cab Calloway and Al Jarreau.
This style of singing involves rapid changes of pitch between the low chest-voice and the higher head-voice. It has been employed in other places and times, but today westerners will know it from Swiss folk music and country and western singers such as Roy Rogers, Hank Williams and Jimmie Rodgers.
Singing in this other distinctly American style is said to be characterized by a "high lonesome sound".
Singing in this style is non-existent today, but was used from at least the 16th to the 19th century. Practitioners were high voiced male singers, and required a controversial surgery to attain it.
A style common to jazz singers employs written words to previously improvised instrumental solos. Manhattan Transfer, Lambert, Hendricks & Ross, Eddie Jefferson and Al Jarreau, among others, have used it.
This two-word italian term is used for the very lowest bass singers. An alternative term is octavist or oktavist, meaning able to sing an octave below the usual bass part.
This song form from Portugal uses a singing style that expresses longing, loss, resignation and fatefulness. It is accompanied traditionally by guitar.
The style of singing utilized by singers such as Smokey Robinson, Philip Bailey, The Bee Gees, Aaron Neville, Frankie Valli, and many others, which allows them to sing in a higher register