Just as I think that ABBA released the wrong Singles sometimes, I think that Blondie did at the end of 1979.
I know that, 'Union City Blue', was connected to a Movie, but the fact that it only reached Number 13 in the UK, shows that many people thought that it was not as good as their 3 previous 1979 UK Singles.
I would have made, 'Slow Motion', (off, 'Eat To The Beat'), the final Blondie Single of 1979. It was fast, catchy, & sing-a-long, & it would have a been a Top 3 UK Hit.
After all they had already had 2 Number 1 Hits in 1979, ('Heart Of Glass', & 'Sunday Girl'), & a Number 2 with, 'Dreaming'. Then came, 'Union City Blue', which was just not as commercial, or catchy, to most of the people who had bought, their previous 1979 Hits.
I love Blondie, & ABBA, & it was fun to see them follow each other at Number 1 in 1980 - 'The Tide Is High' was replaced at Number 1, by, 'Super Trouper', in November 1980. Both Songs have lyrics about a 'number one' in them.
'The Tide Is High' - 'I'm gonna be your number one'
'Super Trouper' - 'Feeling like a number one'
And when, 'Mamma Mia', by ABBA knocked, 'Bohemian Rhapsody', off the Number 1 spot, in January 1976, the Queen Hit had, 'mama mia', in its lyrics - odd coincidences!
However, I was gutted when, 'Heart of Glass', stopped 'Chiquitita', from getting to Number 1, in February 1979! (Holding the ABBA Hit at Number 2, for 2 Weeks, before it dropped).
Blondie wanted Benny & Bjorn to Produce them at one stage - in about 1979, or 1980 - but they said no, as they were busy working on ABBA Tracks.