Sound therapists and Manchester band Marconi Union compiled the song. Scientists played it to 40 women and found it to be more effective at helping them relax than songs by Enya, Mozart and Coldplay.

Weightless works by using specific rhythms, tones, frequencies and intervals to relax the listener. A continuous rhythm of 60 BPM causes the brainwaves and heart rate to synchronise with the rhythm: a process known as 'entrainment'. Low underlying bass tones relax the listener and a low whooshing sound with a trance-like quality takes the listener into an even deeper state of calm.

Dr David Lewis, one of the UK's leading stress specialists said: "'Weightless' induced the greatest relaxation – higher than any of the other music tested. Brain imaging studies have shown that music works at a very deep level within the brain, stimulating not only those regions responsible for processing sound but also ones associated with emotions."

The study - commissioned by bubble bath and shower gel firm Radox Spa - found the song was even more relaxing than a massage, walk or cup of tea. So relaxing is the tune, apparently, that people are being advised against listening to it while driving.

The top 10 most relaxing tunes were: 1. Marconi Union - Weightless 2. Airstream - Electra 3. DJ Shah - Mellomaniac (Chill Out Mix) 4. Enya - Watermark 5. Coldplay - Strawberry Swing 6. Barcelona - Please Don't Go 7. All Saints - Pure Shores 8. AdelevSomeone Like You 9. Mozart - Canzonetta Sull'aria 10. Cafe Del Mar - We Can Fly