1-Chronicles 15:20 Themes and Topics

and Zechariah, Aziel, Shemiramoth, Jehiel, Unni, Eliab, Maaseiah, and Benaiah [were to play] with harps tuned to Alamoth [that is, a high pitch];

Asaph the chief, and second to him Zechariah, then Jeiel (Jaaziel), Shemiramoth, Jehiel, Mattithiah, Eliab, Benaiah, Obed-edom, and Jeiel with musical instruments, harps and lyres; also Asaph played loud-sounding cymbals; Verse Concepts

and with them their relatives of the second rank: Zechariah, Ben, Jaaziel, Shemiramoth, Jehiel, Unni, Eliab, Benaiah, Maaseiah, Mattithiah, Eliphelehu, and Mikneiah, Obed-edom, and Jeiel, the gatekeepers. Verse Concepts

All those chosen to be gatekeepers at the thresholds were 212. They were enrolled by their genealogies in their villages [around Jerusalem], these men [whose grandfathers] David and Samuel the seer had appointed to their official duty. Verse Concepts

David told the chief Levites to appoint their brethren the singers with instruments of music -- "harps, lyres, and cymbals -- "to play loudly and lift up their voices with joy. So the Levites appointed Heman son of Joel; and of his brethren, Asaph son of Berechiah; and of the sons of Merari their brethren, Ethan son of Kushaiah; And with them their brethren of the second class: Zechariah, Ben, Jaaziel, Shemiramoth, Jehiel, Unni, Eliab, Benaiah, Maaseiah, Mattithiah, Eliphelehu, and Mikneiah, and also the gatekeepers, Obed-edom and Jeiel. read more.
So the singers Heman, Asaph, and Ethan, were appointed to sound bronze cymbals; Zechariah, Aziel, Shemiramoth, Jehiel, Unni, Eliab, Maaseiah, and Benaiah were to play harps [resembling guitars] set to Alamoth [probably the treble voice]; Mattithiah, Eliphelehu, Mikneiah, Obed-edom, Jeiel, and Azaziah were to lead with lyres set to Sheminith [the bass voice]. Chenaniah, leader of the Levites in singing, was put in charge of carrying the ark and lifting up song. He instructed about these matters because he was skilled and able. Berechiah and Elkanah were gatekeepers for the ark. Shebaniah, Joshaphat, Nethanel, Amasai, Zechariah, Benaiah, and Eliezer the priests were to blow the trumpets before the ark of God. And Obed-edom and Jehiah (Jeiel) were also gatekeepers for the ark.

He appointed Levites to minister before the ark of the Lord and to celebrate [by calling to mind], thanking and praising the Lord, the God of Israel: Asaph was the chief, next to him Zechariah, Jeiel (Jaaziel), Shemiramoth, Jehiel, Mattithiah, Eliab, and Benaiah, Obed-edom and Jeiel, who were to play harps and lyres; Asaph was to sound the cymbals; Benaiah and Jahaziel the priests were to blow trumpets continually before the ark of the covenant of God.

So David left Asaph and his brethren before the ark of the covenant of the Lord to minister before the ark continually, as each day's work required, And Obed-edom with [his] sixty-eight kinsmen. Also Obed-edom son of Jeduthun, and Hosah, were to be gatekeepers. And David left Zadok the priest and his brethren the priests before the tabernacle of the Lord in the high place that was at Gibeon read more.
To offer burnt offerings to the Lord upon the altar of burnt offering continually, morning and evening, and to do all that is written in the Law of the Lord which He commanded Israel. With them were Heman and Jeduthun and the rest who were chosen and expressly named to give thanks to the Lord, for His mercy and loving-kindness endure forever. With them were Heman and Jeduthun with trumpets and cymbals for those who should sound aloud, and instruments for accompanying the songs of God. And the sons of Jeduthun were to be at the gate. Then all the people departed, each man to his house, and David returned home to bless his household.