Dennis Brown cut a string of classic tunes at the start of the seventies for producer Derrick Harriott. Here are two of the best ones (not counting 'Concentration' of course): 'Silhouettes' and 'Musical Heatwave'. Both of them were included on his 'Super Hits' LP (available on reissue - seriously, you won't regret it!).
When you listen to 'Silhouettes' it's obviously a cover of someone else's tune, but until just now I had no idea who did the original. Thanks to the wonder of YouTube I've managed to cram yet another piece of useless info into my overloaded brain. Here's a group called the Rays way back in 1957:
Here's a wonderful version by Frankie Lymon & the Teenagers:
And here are the Ronettes in 1962: