The archlute (, , ) is a European plucked string instrument developed around 1600 as a compromise between the very large theorbo, the size and Reentrant tuning of which made for difficulties in the performance of solo music, and the Renaissance tenor lute, which lacked the bass range of the theorbo. Essentially a tenor lute with the theorbo's neck-extension, the archlute lacks the power in the tenor and the bass that the theorbo's large body and typically greater string length provide.
As Figured bass bass lines were composed both faster in motion and higher in tessitura toward the end of the 17th century, the archlute began to eclipse the theorbo as the main plucked string continuo instrument. The theorbo lacked the higher notes of the bass lines and the increasing practise of doubling the continuo part with a bowed bass (cello or viol) made the archlute's lack of power in the tenor and bass a less important shortcoming.
The theorbo had been commonly used as the melodic bass instrument in from the beginning of the Baroque and the archlute took over that function too, with the most famous example being Corelli's Opus 1 and 3 trio sonatas which have partbooks for 1st and 2nd violin, 'violone o arciliuto' and a continuo part for organ, a simplified version of the 'violone o arciliuto' book. The violone o arciliuto book has just as many figures to tell the player what chords to play as the organ partbook, which suggests the archlute player would be adding chords above the bass where possible.
The archlute was used in Handel's operas and like repertoire; Giulio Cesare (1724) has continuo parts labelled both arciliuto and tiorba. Perhaps one player would play both instruments.
Music for solo archlute is usually notated in tablature.
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