The fourth #1 song of 1968 on the US Billboard Hot 100 was Love Is Blue by Paul Mauriat. Love is Blue would stay at the top for five weeks from February 10th until it was knocked off the top on March 16th.
Paul Mauriat was a very successful orchestra leader from France- this would be his only hit – yes the third ‘one hit wonder’ in a row of songs that reached #1 by artists who never had another Top 40 hit. The song is a cover of a song by Andre Popp another French musician. This song would fall under ‘easy listening.” 1968 wasn’t off to a very strong start as far as #1 hits go. While “Hello, Goodbye” isn’t one of my favorite songs by my Beatles it is a crowning achievement next to ‘Judy In Disguise”, “Green Tambourine” and “Love Is Blue.” Later in 1968 Jeff Beck did a rock version of Love Is Blue that was a hit single in the UK.
slicethelife 
I remember this song. Weren’t there a string of these orchestral type hits? I remember that “Cake in the Rain” was similar to it. Also didn’t Herb Alpert have several hits around this time? Weird mix of tunes getting to the top of the charts!
A weird mix- that sadly we don’t get today on the charts.
I loved this so much as a kid I actually bought the 45, and it’s still one of my all-time favorite songs.
This song style never fit the pop culture of the times. The classical chords are astounding.