Tutorials/Programs and editors/Minecraft Note Block Studio

The Minecraft Note Block Studio (Previously known as the Minecraft Song Planner) is a music editor for Minecraft. With it, you can compose complex note block songs, requiring no redstone knowledge whatsoever. Unless you are planning on importing your song into Minecraft, the range of the note block can go far beyond the 2 octaves in Minecraft, and the program also give users the ability to add their own instruments and assign custom sounds to them.

You can download this program from its official Minecraft Forums topic, here.