Madonna says her recording sessions with Avicii have produced ''so many great songs''.

The pop superstar has been busy in the studio with the Swedish DJ-and-producer and so far she is very happy with the results of their collaboration

In a post on her Twitter account - accompanied by an Instagram photo of her and Avicii - Madonna revealed: ''The End of a long week with Viking Leader AKA DJ Virgo AKA Avicii! So many great songs! #icantwait #revolution (sic)''

She made another post on Twitter and Instagram - which showed her playing the guitar with Avicii and a group of people - which read: ''My Viking Harem! Great Music Great Vibes! We were grinding on that. Wood! #rebelheart (sic)''

Madonna revealed she has started work on a new studio LP - her first since 2012's 'MDNA' - in February, but at the time she refused to reveal she was working with Avicii on the project.

When asked if she was making a new record, the 55-year-old singer said: ''Yes, plans are in the works already. Don't ask me with who - it's a secret. Top secret.''

Avicii - real name Tim Bergling - has worked with many artists for their releases and his own album 'True', with previous collaborators including Leona Lewis, David Guetta, Aloe Blacc, Adam Lambert and Nile Rodgers.