Gaelic
Gaelic is an adjective that means "pertaining to the Gaels". As a noun, it may refer to the group of languages spoken by the Gaels, or to any one of the languages individually. In particular, the different Celtic languages spoken in both Ireland and Scotland are very often referred to just as "Gaelic", which can cause confusion.
Music
Music is an art form and cultural activity whose medium is sound organized in time. The common elements of music are pitch (which governs melody and harmony), rhythm (and its associated concepts tempo, meter, and articulation), dynamics (loudness and softness), and the sonic qualities of timbre and texture (which are sometimes termed the "color" of a musical sound). Different styles or types of music may emphasize, de-emphasize or omit some of these elements. Music is performed with a vast range of instruments and vocal techniques ranging from singing to rapping; there are solely instrumental pieces, solely vocal pieces (such as songs without instrumental accompaniment) and pieces that combine singing and instruments. The word derives from Greek μουσική (mousike; "art of the Muses"). See glossary of musical terminology.