Well Robert being a professional vocalist certainly threw me, but he turns up with first wife Lizzie & 6-month old son William in 1891.
From there I think I've found his first marriage:
10 Jan 1885. St Jude's, Ancoats, Manchester
Robert Owen, 19, Bachelor, Driller, of 10 Marsh Street. Father: William Owen, Shoemaker
Elizabeth Ann Longworth, 21, Spinster, of 6 Marsh Street. Father: John Longworth, Packer
Witnesses: Thomas & Mary Jane Hammersley
The occupation of Driller certainly fits with the baptisms of the children of William & Mary Ellen Owen, and the name & occupation of his father fit too. But (there's always a but!) .... Ive cross-checked the baptisms against the GRO index and all except one are the children of Robert Owen & Mary Ellen Ward who married in 1914. The only one born to Robert Owen & Mary Ellen Stanley is Marguarite:
Marguarite Owen [Child] of Robert Owen & Mary Ellen [Stanley]
Born: 11 Jul 1917, 22 Jul 1917
Abode: 55 McKean Street
Occupation: Gas Worker