You can put all your Music, Movies, etc on the /dev/sda5 and lets call it DATA Partition. By default this partition will not be mounted, ie, made available for system. You can either mount it manually by clicking on that partition from File Explorer, Nautillus. or You can automount it with Ubuntu boot by adding its entry in /etc/fstab. I use the former method. I don't like it to be mounted all the time, just when I want/need it.
You can create folders in the Partition like, MyMUSIC, myMovies etc then create a 'symlink' in your Home folder. You can access all your Music from Home folder. The 'symlink' will only work if the Partition is mounted.
Here is how you create symlinks it:
To make the Data partition mount with system boot you have edit the /etc/fstab... more instructions:
ln -s /path/to/the/folder /location/of/the/link
Then you can place symlinks as show above or http://ubuntuforums.org/showthread.php?t=2145037 (Read Kopkins' post)
You can also use 'bind' but I can't help you with that in detail.