OK try silence then. Amazing what a difference background music makes regardless of whether people listen or not.
There is royalty free music available but generally it is horrible. (Most call centre hold music is royalty free for that purpose).
I don't really like the way royalties are collected and see many different viewpoints.
When I was leaving school, I did some shifts at a local community radio station in the early 90s. I had access to my very small personal selection of cassettes & LPs, my co-host's bigger CD collection & whatever people had left laying around the studio.
I did a guest spot on another community station within the last year & to compare access to music was amazing. It was all computerised & it was so much easier to play off CDs & digitially.
Either way, both stations could basically play what they wanted as long as they accounted for it for APRA purposes.
But now, I'm in a different position.
Since 2009, I have been hosting a series of music podcasts. To avoid any potential issues, I don't play every artist known to man but I focus on the indie/unsigned/underground sector. I either play their music with their direct permission or from a PR company or a music distribution company. Online, I'm regarded by a music distribution company to be the same as a US college radio station.
I've mainly focused on the unknown sector but that doesn't mean in many cases that the music is rubbish.
Some well known artists that I have played under agreement with music distro companies include Dave Evans, Tommy Emmanuel, Paul Kelly, Dragon, Willie Nelson & Dolly Parton.
I once got offered the chance to feature Nickelback but I drew the line at that.