NET

29 You will sing as you do in the evening when you are celebrating a festival. You will be happy like one who plays a flute as he goes to the mountain of the Lord, the Rock who shelters Israel.

Darby

29 Ye shall have a song, as in the night when a feast is sanctified^D4867; and joy of heart, as of one who goeth with a pipe to come unto the mountain of Jehovah, to the Rock of Israel.

Darby Bible Notes

sanctified - See 2 Kings 10.20; Joel 1.14.

KJV

29 Ye shall have a song, as in the night [when] a holy solemnity is kept; and gladness of heart, as when one goeth with a pipe to come into the mountain of the LORD, to the mighty One of Israel.

KJV Bible Notes

mighty one: Heb. rock.

Strong's

29 Ye shall have a song^H7892, as in the night^H3915 when a holy^H6942 solemnity^H2282 is kept^H6942; and gladness^H8057 of heart^H3824, as when one goeth^H1980 with a pipe^H2485 to come^H935 into the mountain^H2022 of the LORD^H3068, to the mighty One^H6697 of Israel^H3478.