To encourage people to buy music sheets and to return to the theatre, companies produced postcards. The ones here date from around the mid 1900s and the first three come from "Albert's Lyric series". There was an Albert's music store in Sydney in 1905 which specialised in sheet music and Edison phonographs, so the postcards may originate from there.
Firstly, here is the famous Florence Young, singing "Dearie". Florence was the star of J C Williamson's Royal Comic Opera Company. She was also a wonderful singer.
Below is the American Baritone Post Mason, singing Would You Care? A love ballad. Mason did a series of concerts around Australia in 1906-07
Heba Barlow is next, singing"Im trying so hard to forget you" For many years Heba was the leading lady of Irish American John F Sheridan's Company. After Sheridan's sudden death in 1908, Heba went to England to continue her career.
Finally, the song that everybody knows, "Home Sweet Home." Sung by Lilian Hallows and Sidney Howard of the Sidney Howard English Drama Co. They were presented by Harry Rickards at the Criterion Theatre in 1907 according to the reverse of the postcard. This postcard is English and it seems to have been altered to include details of the Australian season.