U2 - Where The Streets Have No Name

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Motivated by friendships with Bob Dylan, Van Morrison, and Keith Richards, the band looked back to the roots of rock music, and Bono focused on his skills as a song and lyric writer.[55] Realising "that U2 had no tradition", the band explored American blues, folk, and gospel music.[56] For their fifth album, The Joshua Tree,[57] the band wanted to build on The Unforgettable Fire's atmospherics, but instead of its out-of-focus tracks, they sought a harder-hitting sound within the strict discipline of conventional song structures. (source: Wikipedia)