

The 54-year-old singer paid tribute to his mum Iris on the band's 13th studio album, 'Songs of Innocence', and admits the autobiographical theme of the record was ''excruciating'' to write because he was determined not to leave anything out.



''It's pretty excruciating stuff.''

Bono covered much of his early life in tunes on the album, including how he changed both ''mentally and spiritually'' after seeing The Clash perform live when he was younger.

He added to Q magazine: ''So we decided to go, 'Are you ready to write about the street you grew up in? Are you ready to write about your friendships that got you through things?

