What does OHD mean in Unclassified?

Oh Happy Day

"Oh Happy Day" is a 1967 gospel music arrangement of the 1755 hymn by clergyman Philip Doddridge. Recorded by the Edwin Hawkins Singers, it became an international hit in 1969, reaching No. 4 on the US Singles Chart, No. 1 in France, Germany, and the Netherlands and No. 2 on the Canadian Singles Chart, UK Singles Chart, and Irish Singles Chart. It has since become a gospel music standard. The recording begins with a muted piano, drum, and bass, backing lead singer Dorothy Combs Morrison on the left-hand stereo channel, then alternates twice with a full-throated chorus that includes a large ensemble, rising to a crescendo with handclaps, and ending with a return to the muted sound as at the beginning. The track is notable for its clear sound given the powerful vocals and the modest equipment used to capture them. It was made at Hawkins' church, the Ephesian Church of God in Christ in Berkeley, California.

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