My first post so, greets

CONTEMPORARY, ACOUSTIC-BASED SINGER/SONGWRITER SONGS with Mainstream Pop Appeal and Male Vocals are needed by an Indie Music Publisher with strong ties to a Major International Record Label and the artists on their roster. He's eager to find original, Mid-Tempo Songs that would appeal to the fans of artists like James Blunt, Robbie Williams, Jon Mayer, etc., etc., etc.
I find this one a bit confusing. James Blunt IMO has a more pop based sound than Jon Mayer so I would aim for something somewhere between the two, but Robbie Williams is nothing like the other 2. He’s not what I’d call an acoustic-based singer/songwriter at all.
Any thoughts?
Thanks,
Kevin.