Subscription music service Napster is raising monthly fees. According to an e-mail sent to subscribers, the non-portable subscription rate will jump 30% from $10 a month to $13 a month. The price change, its first in four years, takes affect Jan. 30.

Last summer, rival Rhapsody similarly raised its rates from $10 to $13. Both developments are a far cry from the $5 monthly rate offered by Yahoo Music when it first launched in 2005. At the time, that move pointed to a price war that would drive down the costs of all subscription fees. Yahoo eventually raised rates to $9 a month.