A custom lean install of OSX is the easiest way to free up HD space, but
you would have to have complete back-ups of everything important
before doing so.
The default OSX install is 12.5 GB
You can easily and safely cut that down to 7.4 GB and less if you are willing to remove completely unused applications.
A few minor things you can do to free up some space without reformatting.
Search your HD for "packages"
There you will find the .pkg installers for all your OS updates.
Burn those to CD and save them in the event you need to reformat.
You have a large assortment of extra printer drivers, language translators, iWork and MS Office demos, GarageBand Demo songs, iDVD themes.
This is all completely unnecessary fluff that a custom lean install would remove.
Download Tiger Cache Cleaner from VersionTracker.
The demo works fine to clear out all your cache buildup.
You might also consider offsight back-up space allowing you to access all your data anywhere you go as needed.
This would allow you to keep your entire audio library on a remote server
and is probably your best and safest solution.
you would have to have complete back-ups of everything important
before doing so.
The default OSX install is 12.5 GB
You can easily and safely cut that down to 7.4 GB and less if you are willing to remove completely unused applications.
A few minor things you can do to free up some space without reformatting.
Search your HD for "packages"
There you will find the .pkg installers for all your OS updates.
Burn those to CD and save them in the event you need to reformat.
You have a large assortment of extra printer drivers, language translators, iWork and MS Office demos, GarageBand Demo songs, iDVD themes.
This is all completely unnecessary fluff that a custom lean install would remove.
Download Tiger Cache Cleaner from VersionTracker.
The demo works fine to clear out all your cache buildup.
You might also consider offsight back-up space allowing you to access all your data anywhere you go as needed.
This would allow you to keep your entire audio library on a remote server
and is probably your best and safest solution.