The Official UK Charts Company said that it was "bound to" incorporate streaming and subscription services such as Napster, but not for at least another year.
The singles chart launched in 1952 and was based on record sales alone. However in 2005, the method of compiling the chart changed to include tracks that had been downloaded.
Martin Talbot , managing director of the Official Charts Company, told the BBC: "The charts have always been there as a popularity poll, as a means of identifying what are the hottest records of the moment".
"I'm sure [music streaming] will come upon us quicker than we might anticipate but none of us really know when it will happen," he said.
"I think ultimately it's bound to happen. But that could be five years, it could be 10 years, it could be 20 years."
However, as there is no cost for the consumer involved in streaming a track, its unlikely they will carry as much weight as paid-for downloads.
"Knowing what a stream is worth compared to a purchase of a download, for instance, is very difficult to identify at the moment, but that's obviously going to be the next step," Talbot added.
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See also: Net downloads change face of UK charts