Dozens of online music broadcasters will go silent on Tuesday to protest a new set of royalty rates that many smaller companies say would put them out of business.

Viacom Inc.’s MTV, Live365, Pandora, AccuRadio and several public radio stations including KCRW in Los Angeles and others will observe the day of silence and encourage listeners to support a bill in Congress that would roll back the new rates. The stoppage applies to ad-supported music streams, not to paid subscription ones.