WASHINGTON - Some small Internet radio broadcasters are rejecting a new offer from a music industry group to pay discounted royalty rates for streaming music online through 2010. SoundExchange, the music industry group that collects royalties from webcasters and distributes them to artists and record labels, said its offer was aimed at resolving a dispute over higher fees due July 15. Smaller providers said the higher royalties would be too big a financial burden. Under the latest SoundExchange offer, qualified webcasters — those earning $1.25 million or less in annual gross revenue and with a certain size audience — could...