Conversation so far:
What was the classic lineup?
CANNOTANSWER.
Who was in the classic lineup?
basically recorded by the Humphreys/McCluskey duo, although included some guest drums from Id drummer Malcolm Holmes, and saxophone from Wirral musician Martin Cooper.
What songs did they perform?
"Messages.
Were there any others?
"Enola Gay".
Did they perform with any other bands or artists during this time?
The tour for this album had a 4-piece band line-up, with saxophonist Martin Cooper.
Did they go on tour?
A tour followed.

Question: what countries were they in?
Self-contained rewrite: what countries were Orchestral Manoeuvres in the Dark in?