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Manuscript paper, also called staff* paper, is the paper with all the lines that songwriters, composers, and arrangers use when writing out music by hand.
You can print out 14 different formats of manuscript paper for FREE at Musicnotes.com's Free Music Page (scroll all the way to the bottom of the page). Or click on the links I've included below.
The most frequently used formats for PIANO and VOICE (or solo instrument) are:
Generally useful manuscript paper: (largest to smallest line spacing)