'40 Gir' celebrates the 40 years of activity of Tre Martelli, the historic/seminal group of traditional Piedmont (North Italy) music. It collects unpublished live recordings from 1977 to 2017 and some studio recordings, also unpublished, specially made for this album. Between explosive live performances at major European festivals and more intimate studio performances, those who do not know the band will be able to discover them throughout their long history. Those who already know them will be able to enjoy unpublished tracks and complete an essential discography for any lover of traditional Piedmontese music.