Yes, but you're buying songs anyway, so that's not bringing in more money.
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You log in through the online store with your psn account and purchase the songs you want then when you go back to your ps3 those songs appear in your transaction history and you can download them.
There is also an update coming for ps3 where it will automatically download the songs to make it even easier.
Here's where i read about the automatic updates and it doesn't mention it being a + only feature.
http://blog.us.playstation.com/2013/...-online-store/
What's wrong with just searching the web store every week? Hell, they're even in the new releases section.