LilyPond

LilyPond is a music engraving program. You can think of it as TeX for sheet music. LilyPond can generate sheet music and MIDI files.

Frescobaldi

Frescobaldi is an editor for Lilypond files. While they can be written in any text editor, Frescobaldi provides additional features for working with LilyPond files.

Building the sheet music and the MIDI file

Frescobaldi

Open the file in Frescobaldi and hit CTRL+Shift+P, to engrave the file in publication mode. You'll get the score as a PDF file and a MIDI file.

Command line

$ lilypond -dno-point-and-click -ddelete-intermediate-files --pdf file.ly

Replace file.ly with the file you want to engrave.