Conversation so far:
When did the band Madness form?
The core of the band formed as the North London Invaders in 1976
Who were the members of the band Madness?
The band included Mike Barson, Chris Foreman, Lee Thompson, John Hasler, Cathal Smyth and Dikron Tulane.
Where did the band Madness play live music?
During 1979, the band began to attract a live following in London, being regulars at the Dublin Castle in Camden Town.
Is there anything else interesting in the article on the band Madness besides their formation, band members and live music venues?
Madness have had 15 singles reach the UK top ten
Did anyone else leave or get kicked out of the band Madness?
Graham McPherson took over the lead vocals from Tulane, who went on to be an actor under the name Dikran Tulaine.

Question: How many members were left then?
Self-contained rewrite: How many members of the band Madness were left after 1979?