The phrase "a few bars" is often used to refer to a short section of a musical composition. It is a common term in the world of music, particularly in genres like jazz, blues, and hip-hop. There are several synonyms for this phrase that can be used interchangeably. For instance, one could say "a short segment," "a brief passage," "a snippet," or "a few measures" to convey the same idea. In any case, these terms all refer to a small portion of a song or piece of music, and can be useful in describing musical performances or compositions.