We're not short of streaming music options in Australia, but here's another: Pandora, the streaming service which specialises in creating playlists based on the "genome" of music you already enjoy, is once again available to Australians after a long period where the site was geo-blocked.
Pandora's emphasis is on streaming radio rather than track selections: you name an artist or genre and it picks other tricks which it thinks match. The basic version is free but includes ads: you can upgrade to an ad-free version with higher-quality audio and a desktop app for $US36 (12 months) or $US3.99 per month.
The market for streaming music is ultra-competitive right now, but Pandora's in-depth knowledge of artists and genres does give it a point of difference (though I suspect people in Australia will confuse it with the bracelet company). If you're a fan, tell us why in the comments.