Quarteto Em Cy has been played on NTS over 60 times, featured on 64 episodes and was first played on 2 May 2014.

Quarteto em Cy (Quartet in Cy) is a MPB Brazilian vocal quartet originally composed of four sisters hailing from Ibirataia, a town located in the Brazilian state of Bahia: Cybele, Cylene, Cynara and Cyva – their real first names. The group name was given by poet and lyricist Vinicius de Moraes (a joke about the fact that the first names of the four sisters begin with "Cy"). They're considered the greatest Brazilian female vocal quartet, in addition to being the oldest.

Noted for the extraordinary precision of the vocalists' intonation and delivery, the quartet performed and recorded with almost every single major Brazilian artist of the '60s and '70s; their popularity exceeded and still exceeds the borders of their native country. They met with great success in America in the mid-sixties, and have a considerable following in Japan, where they still tour regularly.

They started performing in 1959, appearing on local television in that year. Cyva, the leader of the group, then moved to Rio de Janeiro, and persuaded her three sisters to join her there. They then started to make regular appearances in the boates (small nightclubs) of Rio, particularly Bottle's bar and the legendary Zum-Zum, where they caught the attention of Vinicius de Moraes and other prominent figures of the bossa nova scene. Their first album was released in 1964, and was to be followed by regular releases up to the late '90s, at the frequency of one a year, and sometimes more.

In the late 1960s, the group achieved international success under the title The Girls from Bahia, having undergone changes in its original composition. The first modification happened in 1966, when the youngest sister, Cylene, left the group to marry, getting replaced by Regina Werneck. Later, sisters Cynara and Cybele left the group to form a brief succesful duo that won, in 1968, the III Festival Internacional da Canção. Both got replaced by Sonia Ferreira and Semíramis Rubim, remaining only Cyva from the original formation, but despite the success of the duo, Cynara decided to rejoin the Quartet in the place of Semíramis. After a brief hiatus, the group resumed its activities in 1972 with the singers Cyva, Cynara, Sonia, and recently added member Dorinha Tapajós (replacing Regina). In 1980 Dorinha left for health reasons and was replaced by Cybele, who remained in the group until 2013 and was replaced by Keyla Fogaça, by her own indication. On 21 August 2014, at the age of 74, Cybele died of a lung ischemia at her home in Rio de Janeiro. Since then, after periods of work, Sonia and Keyla left the quartet, adding Corina Viana into the group.

The group's voices have transited through notable Brazilian music composers such as Vinícius de Moraes, Toquinho, Dorival Caymmi, Chico Buarque, Tom Jobim and many others. Their phonographic recordings have been released on more than 30 records - both in Brazil and abroad. With a solid and unwavering career for fifty years, Quarteto em Cy remains one of the most remarkable and expressive vocal groups in the history of MPB.