I've noticed a new trend in television commercials. Take the Cadillac commercials. Initially they featured Kate Walsh and the awesome guitar part from Hum's classic song 'Stars'.
Now they feature Lance Reddick from the Wire and that one really awesome episode of the X-Files--and a clip with the same effect, the same atmosphere and general Hummishness, but a sound-alike clip nonetheless, that likely costs Cadillac none of the royalties they had to pay for the HUm clip.
Likewise a Walmart commercial features an instrumental from Badly Drawn Boy's great About A Boy soundtrack, and later broadcasts of the commercial run with a sound-alike, with the same twinkling glockenspiel as the original without any of the residuals to Badly Drawn Boy.
Way to thrift it up, Madison Avenue!