In very much the same idea that the title suggests, Time to Unwind is an exceptionally relaxing song at a solidly slow 65 BPM, but manages to complicate this notion by introducing a back beat with drums playing double time at 130 BPM. The tension that arises from this concept is present for most of the piece, and in more ways than just tempo feel.
The song opens up with a nice, full-sounding bass guitar line and some syncopated chord accents from an electric-acoustic guitar accompanying a solo male vocalist. It's certainly an attitudinal gesture to an old, Motownsian, style---from the grooviness of the bassline to the the filter effects used on the guitar and the vocals that imitate the lower fidelity recording abilities of 1960s microphones. The nostalgic sound heralds a sense of calm that complements the relaxed feel the song attempts to create.
But suddenly, just a few bars in, a loud center-panned electric snare drum disrupts the calm and ushers in both a strong double-time feel and a complication in musical genre. From this point on, the backing drumbeat is almost entirely synthetic and very reminiscent of hip-hop, underscoring the still 1960s R&B melody/harmony.
So you've got a song which attempts to exude the tension between something which is calm and something which isn't. Wait, wait, wait...what's this dude singing about again? I'm glad you asked. He's trying to convince a reluctant would-be lover to relax and come to bed with him. Yo! The instrumental layout of the song is in sync with the lyrics? Yeah. That's cool. For real though, it's really clever and once you understand this discourse the arc of the song seems to come out so much more.
The all acoustic first 20 seconds is a simple invocation from the speaker to his partner, when the drums come in the partner becomes more apprehensive, but the speaker remains composed in his argument. Eventually though, even the Motownsian acoustic music disappears and we're left with all the melody, chords, and harmonies being handled entirely by electronic instruments. Even the vocals are put through an effects filter that has them sounding especially robotic. This, of course, signals the speaker's failure to get this person in bed with him. Indeed, he's left without any real argument, just wailing desperately that it's "time to unwind." If all of that isn't cool enough for you, the song has a really catchy melody and it's really groovy. You should give it a listen, maybe two.