On Wikipedia https://en.wikipedia.org/wiki/I_Musici
Alternative Spellings I Musici di Roma
Creation 1951
City Rome, Metropolitan City of Rome, Italy
Country Italy

[…] The group was formed in March 1952 by 12 students at the Accademia di Santa Cecilia, Rome, who developed a common interest in pre-Classical music during conservatory meetings. Upon origination the ensemble was composed of six violins, two violas, two cellos, a double bass, and a harpsichord; there were three women and nine men. […] The name "I Musici," literally "The Musicians," was chosen by the performers to reflect their enthusiasm for the spirit of the music of an epoch in which "professionalism" had not yet assumed its present pervasive significance. They came together with the single purpose of expressing their deep love for music, and the purity of their intention is heard at performances and on recordings.

Making their debut performance at the Accademia in 1952, I Musici began to achieve international fame the following year. Their career developed rapidly, beginning with concert tours throughout Europe. […] They have also played at many music festivals, including those of Salzburg, Holland, Graz, Menton, Venice, York, Copenhagen, Aix-en-Provence, and Edinburgh. […] One of the most characteristic (and widely influential) features of the ensemble is its lack of a conductor during performance. Felix Ayo, leader of the group between 1952-1968, has said that "to perform without a conductor is normal, I think. It is in the true tradition of the élite music of the Italian Baroque. One finds a conductor only later, after Vivaldi and Corelli. Before, with the concerto grosso and the concerto da camera, there was only the first violin giving the start and tempo with some head movements. And that was all." Among I Musici, Ayo said, music making is a democratic experience. "During rehearsals, the music is discussed by everyone. Everyone's opinion has the same value. It is by mutual agreement that we finally decide how certain details should be handled." The group does have a leader, however; the post has changed hands over the years between Ayo, Roberto Michelucci (1968-1972); conductor, music director, and virtuoso violinist Salvatore Accardo (1972-1977); Boccherini Quintet and Carmirelli Quartet founder Pina Carmirelli (1977-1986); and Federico Agostini.

I Musici over the years has constantly built upon its strengths, and the group members to apply the same dedication to their artistry as they did upon formation. Their performances can be heard on over 45 recordings, almost all under the Philips label, at times with flute and harp. Allmusic