We could tell you about the streets of Perugia's historic centre on those July days, following the blues notes of B.B. King's guitar, or accompanying Keith Jarrett's piano melodies with your voice; or we could tell you about the excitement of hearing Sting and Eric Clapton's chords, but it would not be enough to talk about Umbria Jazz, the international festival dedicated to Jazz in all its nuances, which has been held in Perugia since 1973.