Fleetwood Mac - Long Grey Mare (c.1968)
…”Fleetwood Mac obviously wanted to cover several different blues styles on their debut album, and they definitely do so. “Long Grey Mare” is an up-tempo almost jump blues with a strong boogie feeling. A straight-ahead 4/4 rock/blues progression guides the melody, which is buttressed by Peter Green’s tasteful harmonica work. Although the lyrics are certainly derivative of several older blues songs, the overall effect is that of an excellent period piece and shows off the band’s ensemble playing quite well.” - allmusic.com