It is mid-morning outside the Pompidou Centre in Paris and Patti Smith is talking to me on the phone – she is trying to puzzle out how best we are to find each other within the labyrinthine building: she is somewhere inside working on an exhibition, a sound and visual montage of three French poets: Arthur Rimbaud, Antonin Artaud and René Daumal. At 75, she is the figurehead of American punk – her 1975 album, Horses, has often been selected as one of the top 100 albums of all time – and with each year that passes, she becomes more age-defyingly remarkable. She spent much of last year touring and…