Bla Taget (lit. The Blue Train) is a Swedish progg-band, that used to go under the name Gunder Hagg, the name of a legendary Swedish runner, but after name conflicts occurred they changed name to Bla Taget (which was a ride at the amusement park Grona Lund) in 1972. 　　Their lyrics (mostly written by Bengtsson, Rasmusson, Berger and Nylen) cover a wide range, from marxist analysis and invitations to revolution to satire, art criticism, 1940s childhood nostalgia, images from daily life and experimental pop art works.