"Tunes" (as opposed to "songs") are the instrumental melodies of music for dancing or listening. Some tunes now known as instrumental pieces emerged from vocal traditions, and the reverse is also true. Some sources for finding notated versions of tunes include:
The below sources include tunes in ABC format, a form of music notation that is written with letters and numbers rather than dots on a staff. Many tools exist to convert ABC into standard notation, including the Tune-O-Tron Converter, desktop programs, and iOS and Android apps (for mobile, Tunepal, Tunebook, and Zap's ABC are some of the best apps).