It was written by Barry Mann and Cynthia Weil and appeared on his album Billy Joe Thomas.
[1] The song is sung in a first-person narrative of an adolescent or adult raised by a single teenage mother during the early years of rock-and-roll.
Despite the bleakness of their situation, whenever the child cries, the mother sings him to sleep with a 'sha-na-na-na-na-na-na, it'll be all right...sha-na-na-na-na-na-na-na-na, just hold on tight'.
In the second verse, the narrator notes that despite hardships, they'd 'dream of better mornings when Mama sang her song', and that while it didn't make sense to try to recall the words, the loving meaning beneath them was all that mattered.
At around three minutes, Thomas sings his final vocals, and a Beach Boys sound (provided by Dave Somerville and three members of the Ron Hicklin Singers: Tom Bahler, Gene Morford & Hicklin) begins then carries the track to over 4 minutes.