As recently mentioned, I'm a pretty big fan of Spotify. Speaking as someone who never got over getting burned by my purchase of Stroke 9's Nasty Little Thoughts I'm a big fan of having the chance to listen to a record all the way through before making a purchase.

In their advertising the company is quick to promote the fact that they have millions of tracks just waiting to be streamed. Chances are good that if you want to hear a song it'll be there.

But not always.

Even with Spotify's millions of tracks, some of the biggest songs in the rock music canon are unavailable in their original form. That's OK, because in many cases there's a suitable alternative just a few clicks away. Here are ten of the missing tracks, along with replacements that are in the same ballpark.

10. "Pour Some Sugar On Me," Def Leppard Yes, the anthem to countless pole dances across this fair nation is unavailable for streaming, as is most of the Leppard catalogue. If you're looking to get your fix of the group your options are limited to a live album, except in the case of "Pour Some Sugar On Me." If you don't mind listening to the band go through the motions there's a 2012 rerecording of the track available.

9. "Enter Sandman," Metallica It's not exactly shocking that Metallica hasn't embraced a service that they don't own themselves. Fortunately for fans, some of their tracks have snuck into the service via compilation albums. One of those features a trio of songs from their performance at the Rock and Roll Hall of Fame Concert, including the 2009 version of the band performing their biggest song.

8. "Money," Pink Floyd Although 2011 was dubbed by their label as "The Year of Pink Floyd," that goodwill did not extend to putting their albums up to be streamed online. Your dreams of syncing up Dark Side of the Moon to The Wizard of Oz for free may have been dashed but if you're in need of a Floyd fix there is hope. Roger Waters has most of his catalogue up on the site, including many Floyd classics via In The Flesh.