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Europe's hottest music-streaming service may have launched to much fanfare in the U.S. over the summer, but not everybody is enamored. Spotify's royalty payments, it turns out, bring significantly lower revenue to artists than digital and physical music sales. For a growing number of smaller artists, this has quite literally become a deal killer, as many of them have opted to keep their music off of Spotify and similar services.

ST Holdings, a music distributor that represents over 200 labels, recently asked those labels if they would like to keep their catalogues on services like Spotify and Rdio. Four of them said yes. So, citing a recent survey showing that streaming services hurt music sales, ST Holdings pulled its music from Spotify, Rdio, Napster and Simfy.

Peer-to-peer music streaming app Grooveshark has had an-again off-again relationship with mobile providers. Last summer, the service hit iOS only to be pulled from the app store just days later.

Today, Google booted the app from the Android Market in "a move that comes after some of the top music labels have accused the service of violating copyright law," according to CNET's Greg Sandoval.

The personalized music streaming company Last.fm has announced that its radio service will become an ad-free, subscriber-only feature on iPhones and Androids, starting February 15.

Last.fm Radio will remain free via its website and desktop app as well as for U.S. and U.K. users of Xbox Live and Windows Mobile 7 phones.

Last.fm Radio offers a personalized station, playing full song tracks based on users' preferences. Currently, that streaming service is free in the U.S. and U.K. via an ad-supported app.

Napster, the once peer-to-peer music sharing service turned pay service, has finally entered the mobile music market for Apple users with today's release of a Napster app for the iPhone, iPad and iPod Touch.

Though it's entering the market a bit later than some competitors, it comes with a larger catalog than some and features similar to those that have tipped the scales for other services.

Later tonight, at an event in New York, online music service Slacker Radio plans to unveil a major upgrade to its service that will turn it from an Internet radio service into an on-demand music platform similar to Rhapsody, MOG and Rdio. Right now, Slacker only allows users to set specific songs and band as the basis for their custom radio stations (similar to Pandora), but users don't have control over the actual songs that will play in these stations. Now, for $9.99 per month, Slacker users will be able to subscribe to Slacker Premium Radio and pick the exact songs and albums they want to hear.

Somewhere between Napster and Kazaa on the historical timeline of online music sharing, there was Audiogalaxy. It was a great Web-based service that offered tons of high-quality and rare MP3s before it ran into some legal trouble and was shut down.

We've missed it, sure, but now it's back, and this time it's turning your computer into a streaming music server, giving you access to your home library from wherever you are: on any computer and even on your iPhone and Android smartphone.

MOG, the online demand music service whose accompanying mobile applications are among the best of the breed for streaming tunes to your handset, has just released its highly anticipated iPhone app upgrade. With the now iOS 4 compatible app, MOG addresses one its users' top complaints: no multi-tasking support.

Now the app runs in the background, allowing you to listen to music while working with other apps. This, plus a few other features, make the new MOG app the must-download update of the day.

It's been four months since we first got a preview of online music service MOG's mobile offerings for Android and iPhone and now the waiting is finally over. Like most any new app, it has a few bugs and a few features missing (like multitasking and fast app switching for iOS 4) that we hope to see with future updates, but otherwise proves to be a solid entry into mobile, cloud-based music apps.

MOG, the increasingly popular on-demand music service, just announced its first hardware partnership. MOG's users can now access the service from their Roku players in the living room. Last week, Drew Denbo, the company's senior vice president of business development, told us that MOG believes that as Internet-connected devices like the Roku become more popular, users will finally be able to take their online entertainment options beyond the desktop and into the living room. On the Roku player, MOG users will be able to access their libraries, playlists and artist radio stations.

Everybody piled into the ballroom today at the Austin Convention Center to hear Spotify CEO Daniel Ek give the final keynote interview of SXSWI of 2010 fully expecting to be blown away with the release of the peer-to-peer music player.

Instead, we got somewhat evasive and allusive answers on when to expect a U.S. version and were left looking to yesterday's announcement of MOG's move to mobile, with full knowledge that Napster is nipping at its heels.