Conversation so far:
What is the relation between Stewart and The police?
1976, Copeland founded the Police with lead singer-bass guitarist Sting and guitarist Henry Padovani (who was soon replaced by Andy Summers), and they became one of the top bands.
Which song did the band release?
The Police's early track list was mostly made of Copeland's compositions, including the band's first single "Fall Out" (Illegal Records, 1977) and the B side "Nothing Achieving".
Were the songs successful?
Though Copeland's songwriting contribution was reduced to a couple of songs per album as Sting started writing more material, he continued to co-arrange all the Police's songs.
Which of his songs were more successful than the other?
Amongst Copeland's most notable songs are "On Any Other Day" (where he sang lead vocals too), "Does Everyone Stare" .
Did he work with other people outside his band?
Copeland also recorded under the pseudonym Klark Kent, releasing several UK singles in 1978 with one ("Don't Care") entering the UK Singles Chart that year.

Question: Were the songs successfull?
Self-contained rewrite: Were Stewart Copeland's UK singles in 1978 successful?