Really hard Maths: 1 + 2 =?

Questions

'this ain't no party, this ain't no disco ..' were lyrics from which group's 1979 release 'life during wartime'?

'tres hombres' was the 1973 release by which el paso texas band known for the beards?

'under my wheels' and 'be my lover' were cuts of whose 1971 'killer' release?

'we had joy, we had fun ..' what is the song title?

'you get a shiver in the dark, it's raining in the park ..' what's the dire straits song title?