Musicologists have been studying the work song, a piece of music closely related to a specific type of work. Some

specific categories of American work songs include cowboy songs, agricultural work songs, and sea shanties sung by

sailors. These songs were sung without the use of instruments, and in some work situations they helped to establish

rhythm among the workers. For example, sailors sang work songs when engaging in activities that required coordinated

efforts such as rowing, raising the anchor, or adjusting the rigging

If the underlined phrase were deleted, the sentence would primarily lose a detail that__

Is redundant and unnecessary

is grammatically incorrect

provides relevant and specific examples

Is Irrelevant to the main idea