From U2.com
BONO: I've never practised harmonica in my life, ever. The only time I have ever played harmonica has been as we were recording or live on stage. I quite like it - I'm not very good at it but I'm in a line of not very good harmonica players, as I see it. 'Trip Through Your Wires' was another demonstration of how easy it is to write a song, or not, as the case may be. I wrote it in a few minutes. It had a nice jaunty feeling that I thought might balance some of the other things. It was inspired by a series of phone conversations I had with somebody, who might have meant well and who was fascinating in their own right, it's just they were pretending to be somebody else.