Here are some blank music papers in PostScript and PDF formats.
All are for 81/2 x 11 paper (portrait orientation) unless otherwise noted.

• 6-stave (large for elementary school use) PS PDF
• 8-stave paper for parts or lead sheets PS PDF
• 10-stave paper for parts or lead sheets PS PDF
• 9-stave paper for sketches (landscape) PS PDF
• instrumental solo with reduced-size solo staff PS PDF
• instrumental duet PS PDF
• instrumental trio PS PDF
• instrumental quartet PS PDF
• instrumental quintet PS PDF

• piano (keyboard) solo PS PDF
• organ solo PS PDF
• guitar tablature PS PDF

• piano and organ duet PS PDF
• woodwind trio PS PDF
• brass trio PS PDF
• string trio PS PDF
• string quartet PS PDF
• woodwind quintet PS PDF
• brass quintet PS PDF
• brass choir PS PDF

• full concert band (81/2 x 14) PS PDF (11 x 17) PS PDF
• marching band PS PDF
• brass band PS PDF
• jazz band PS PDF

• string orchestra PS PDF
• string orchestra with piano PS PDF
• small orchestra PS PDF
• full orchestra (81/2 x 14) PS PDF

• vocal solo with piano PS PDF
• two-part vocal with piano PS PDF
• SSA PS PDF
• SAB PS PDF
• SATB PS PDF
• SATB hymnal PS PDF
• SATB with piano PS PDF
• SSATB PS PDF