Twisted Wave

I use this app for all of my music editing. It's called twisted wave and it's available in the app store and is very user friendly while still featuring all the functions and tools that I need.
I have edited at least 100 songs and this app makes it so easy. You can share your edited songs via email but my favorite way to share is to upload directly to Dropbox and email from there. That way the song is still in my Dropbox, available at anytime.