The fifth episode of the program on music, visited through instruments. This time we will enter the world of instruments where the vibration of the strings creates the sounds, such as the guitar, the lute, the mandolin and many others. As always Piero Angela will show films, live recordings and studio meetings with famous soloists, such as Franco Cerri, the harpist Elena Zamboni, the classical guitarist Emanuele Segre. We will also meet Renzo Arbore. Stringed instruments are very ancient. We will talk about the lyre, the harp and a very widespread "plucked" instrument, indeed the most widespread, especially among young people: the guitar. As in every episode, two great jazz musicians: Franco Cerri and Gianni Basso in duet and Piero Angela on piano. The guests in the studio on this musical journey are once again Giovanni Bietti for classical music and Adriano Mazzoletti for jazz.