The British Phonographic Industry (BPI) has said it welcomes indications from two internet service providers that they will tackle illegal filesharing.
The BPI said its calls for cooperation have been heard
According to the BPI, Tiscali and Cable & Wireless suggested that they will suspend accounts that are being used to illegally download music files.
The BPI has been stepping up efforts to stop internet users from downloading and sharing music albums and singles.
It says the unauthorised trade is a massive threat to its business.
Matt Phillips, a spokesman for the BPI, said that the trade group had written to Tiscali and Cable & Wireless on Tuesday to elicit their help.
"It was a call for cooperation and that call has been answered," he said.
In the letter, the BPI said it had identified 17 Tiscali IP addresses and 42 Cable & Wireless IP addresses which were used to upload "significant quantities of music owned by BPI members".
While the BPI can identify which service providers have customers breaking filesharing rules, only the ISPs themselves can identify the exact customers.
Should the ISPs refuse to reveal the names and details of their clients, then the BPI could turn to the courts to get them to do so.
Tiscali said that it was willing to cooperate with the BPI, but does not "automatically suspend customer accounts on request".
The company said it had called on one client to explain their actions, and asked for more evidence from the BPI regarded the 16 other allegations.
"We are reviewing the information the BPI has provided and will respond appropriately," Tiscali said, adding it needed to balance the rights of its customers and the requirements of the BPI.
Cable & Wireless said it would "take whatever steps are necessary to put the matter right".
Prior to Tuesday's letter, the BPI had taken legal action in 139 filesharing cases. The four that have gone to court have produced verdicts in BPI's favour, while 111 individuals have settled out of court.
"This should send out a message to people who use illegal filesharing networks that their internet connection is at risk if they break the law," the BPI's chairman Peter Jamieson said on Wednesday.