Before moving to Mercury, the Statlers owed Columbia, the label to which Johnny Cash recruited them, one more album. My recollection is that the 1969 album of gospel tunes was originally titled 'How Great Thou Art,' then later retitled 'Oh Happy Day.'
Recently, a CD entitled 'Oh Happy Day' got hopes up for fans of pre-Mercury Statlers, but it was simply a compilation of Columbia recordings, and the title song was the only one from the Columbia gospel album. Most or all of the other stuff was already available on CD.
This is the rest of the 1969 gospel album. It showcases the Statlers' unique voices and harmony like nothing since. They re-recorded many of the songs for their pair of biblically-themed albums soon after joining Mercury, but the ones I have heard indicate that they had already lost their edge.
Particularly for fans of Lew DeWitt, the original Statler Brothers tenor, this album is a must. If you've heard this version of 'How Great Thou Art,' you won't be surprised by DeWitt's highs on 'Pass Me Not,' and his own 'Just in Time.' The rest is good, too, and of particular interest is 'Less of Me,' written by Glen Campbell.
If you want the complete 1969 album, you'll have to find 'Oh Happy Day' separately, because it is not included here.