New Living Translation
The musicians, all prominent Levites, lived at the Temple. They were exempt from other responsibilities since they were on duty at all hours.

American Standard Version
And these are the singers, heads of fathers houses of the Levites, who dwelt in the chambers and were free from other service ; for they were employed in their work day and night.

Berean Study Bible
Those who were musicians, the heads of Levite families, stayed in the temple chambers and were exempt from other duties because they were on duty day and night.

Douay-Rheims Bible
These are the chief of the singing men of the families of the Levites, who dwelt in the chambers, by the temple, that they might serve continually day and night in their ministry.

English Revised Version
And these are the singers, heads of fathers' houses of the Levites, who dwelt in the chambers and were free from other service: for they were employed in their work day and night.

King James Bible
And these are the singers, chief of the fathers of the Levites, who remaining in the chambers were free: for they were employed in that work day and night.

World English Bible
These are the singers, heads of fathers' [houses] of the Levites, [who lived] in the rooms [and were] free [from other service]; for they were employed in their work day and night.

Young's Literal Translation
And these who sing, heads of fathers of the Levites, in the chambers, are free, for by day and by night they are over them in the work.

1 Chronicles 9:33 Additional Translations ...