A string orchestra has only string instruments, i.e., violins, violas, cellos and double basses. Beltrami made use of a detuned piano with violins, violas, and cellos. All-fifths tuning is typically used for mandolins, cellos, violas, and violins. The sextet is scored for two violins, two violas, and two cellos. It normally consists of first and second violins, violas, cellos, and double basses. Each concerto was printed in eight parts&colon; four violins, two violas, cello and continuo. The work is scored for two violins, two violas and cello. Fewer electric violas are available relative to electric violins. Merlin also experimented with violins and violas. It begins with the violins and violas. This viola is one of three known Guarneri family violas. Luthiers have also created five-stringed violas, which allow a greater playing range. There are twelve known extant Stradivari violas. The instruments of the samba paulista were violas and pandeiros. Some such instruments are somewhat longer and should be regarded as violas.