Blondie frontwoman Debbie Harry thinks pop stars need to ''step out of their comfort zones''.

The 'Heart of Glass' hitmaker and her bandmates - Chris Stein, Clem Burke and Tommy Kessler - release their new album 'Ghosts of Download' next month and she feels it's important to continue to re-invent yourself as an artist and has accused many musicians of being too safe.

Debbie told Gay Times magazine: ''I'm excited because I love the new stuff. It's always a chance to breathe fresh air. It's good for artists to step out of their comfort zone.''

Although the 68-year-old singer likes to see artists take risks, she also doesn't mind when people cover her music.

Asked if she knew of Atomic Kitten, who released a cover of her 1967 track 'The Tide Is High', she replied: ''Of course [I know who they are] I thought it [the cover] was ... OK. It's funny how that song keeps coming around, it's very interesting how that happens.

''There's something about it. We've been working on a surprise with that song [for the new album]. There's a guest artist on it.''

Meanwhile, Blondie have announced they will perform at this year's Glastonbury Festival at Worthy Farm in Somerset in June.