Premium customers, who pay £9.99 per month to gain access to the millions of tracks in its database ad-free, can now listen to music in CD-quality sound following the upgrade, which, at 320 kb/s, is the highest available from any music-streaming service says Spotify.
When Media Week interviewed chief executive Daniel Ek recently, he said while the company expected the vast majority of people to use the free, ad-funded service, Premium customers were important to the business.
"Theoretically, if you can make 10% of your users pay, you're really good, and we're striving to be really good," he said.
Speaking following the upgrade, Ek said the company now offered "an unparalleled listening experience."
The Stockholm-based company launched as an invitation-only music service in October last year across Europe, having secured deals with major labels including Universal, Sony BMG, EMI and Warner.
Spotify was opened up to everyone in February and, by April, had already clocked up more than 1.5 million users, approximately a third of them in the UK, with 40,000 new users join every day, of which 50 to 60% are from the UK.
Since launching, the company has tied-up advertisers including the COI, Wired, Xbox, T-Mobile, Vodafone, Philips, HMV, Sainsbury's, Nissan, Sony Pictures, Paramount and Universal.
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