This refers to the people of the nations of Moab and Ammon. You can make clear the understood information. (See: [[rc://en/ta/man/translate/figs-explicit]])
This may be a musical term that tells people how to sing or play their instruments here. Some translations write the Hebrew word, and some translations do not include it. See how you translated this in [Psalms 3:2](../003/001.md). (See: [[rc://en/ta/man/translate/translate-transliterate]])