I've never tried one of these before but I've seen a few people posting these so I thought I'd give it a go (with some help from lucymorningstar on how to embed a youtube file)

Day 1 - A song you like with a colour in the title

The Blue Danube (or for it's full translated title By The Beautiful Blue Danube)
An der schönen blauen Donau, Op. 314, a waltz by the Austrian composer Johann Strauss II, composed in 1866. This version is played by André Rieu & his Johann Strauss Orchestra playing and is recorded live at Empress Sisi's castle; Schönbrunn Palace Vienna, Austria with dancers from the famous Austrian Elmayer Dancing School

Samantha and I danced to this at our wedding. And yes, we waltzed. It still makes me want to dance with her.