Looks like this is JBG's first marriage:

Marriage: 23 Jul 1833 St Mary the Virgin, Eccles, Lancashire, England
Joseph Geoghegan - of this Parish
Elizabeth Hopwood - of this Parish
    Witness: Thomas Gorse; John Morris
    Married by Banns by: Wm. MacIvor Curate
    Register: Marriages 1833 - 1834, Page 72, Entry 214

followed by a mass baptism:

Baptisms: 9 Nov 1845 St Philip, Salford, Lancashire, England
Harriet Geoghegan - Child of Joseph Geoghegan & Elizabeth
    Abode: Salford
    Occupation: Fustian Cutter
    Baptised by: I. Robley
    Register: Baptisms 1826 - 1848, Page 151, Entry 1203

Baptisms: 9 Nov 1845 St Philip, Salford, Lancashire, England
Edwin Geoghegan - Child of Joseph Geoghegan & Elizabeth
    Abode: Salford
    Occupation: Fustian Cutter
    Baptised by: I. Robley
    Register: Baptisms 1826 - 1848, Page 151, Entry 1204

Baptisms: 9 Nov 1845 St Philip, Salford, Lancashire, England
Frederick Geoghegan - Child of Joseph Geoghegan & Elizabeth
    Abode: Salford
    Occupation: Fustian Cutter
    Baptised by: I. Robley
    Register: Baptisms 1826 - 1848, Page 151, Entry 1205

Baptisms: 9 Nov 1845 St Philip, Salford, Lancashire, England
Joseph James Geoghegan - Child of Joseph Geoghegan & Elizabeth
    Abode: Salford
    Occupation: Fustian Cutter
    Baptised by: I. Robley
    Register: Baptisms 1826 - 1848, Page 151, Entry 1206

Baptisms: 9 Nov 1845 St Philip, Salford, Lancashire, England
James Geoghegan - Child of Joseph Geoghegan & Elizabeth
    Abode: Salford
    Occupation: Fustian Cutter
    Baptised by: I. Robley
    Register: Baptisms 1826 - 1848, Page 151, Entry 1207

Baptisms: 9 Nov 1845 St Philip, Salford, Lancashire, England
Elizabeth Geoghegan - Child of Joseph Geoghegan & Elizabeth
    Abode: Salford
    Occupation: Fustian Cutter
    Baptised by: I. Robley
    Register: Baptisms 1826 - 1848, Page 151, Entry 1208


No mention of his musical activities.