Our pick of Bono's These Songs Changed My Life: 60 RPM playlist 'thank you' notes continues with this letter to Ralf and Florian from Kraftwerk. He's not the only Kraftwerk nut in U2 with Edge also voting to cover 'Neon Lights' as the B-side to their 'Vertigo' single. See https://www.u2.com/news/title/60-songs-that-saved-my-life for the full lowdown.