After the books, the rudiments, the tecnique: playing (drums) is a matter of music. And is a matter of songs. I was thinking to some good songs for drums practice. Not necessary ‘great’ songs, but, at least, with an interesting drums track or groove or fills; songs that need some ’soul’ to be played.
This is [...]

Famous Lynyrd Skynyrd’s tune. Tons of covers, almost every band has played it once in life. Simple with a cool and relaxing groove and some obbligato to pay attention to. (And, yes, riff D-C+9-G is good for tuning guitar)
Original studio version
Wikipedia: song’s history
Sweet Home Alabama drum score .pdf (544 kb)