Rock band Pink Floyd have launched legal action against record label EMI over payment of online royalties and the marketing of their music.
The group, signed to EMI since 1967, are disputing the way payments for their digital sales are calculated.
They are also seeking a ruling on whether the label can sell individual tracks from their original albums.
Pink Floyd did not appear at the first hearing of what is expected to be a lengthy case.
Their lawyer, Robert Howe QC, told the court that the musicians wanted "to know where they stand as a matter of contract".
Mr Howe said EMI contend that the sale of individual tracks from albums "only applies to the physical product and does not apply online".
He added that the practice "makes no commercial sense" and contravenes agreements signed by both parties.
Pink Floyd's back catalogue is the most lucrative in pop music apart from that of The Beatles.
I've yet to hear of any artist receiving their share of the money from online downloads?
