There was some interactions listed in the 1.24 patch that were not used in Pets. These interactions sound like something from Showtime.

Sing Chorus…
End Song…
Sing Verse…
‘Sing A Gram’
‘Romantic Sing A Gram’
‘Celebration Sing A Gram’
‘Cheer Up Sing A Gram’

Source: SimsVIP and 5050 Sims