The Sonoma Valley, in northern California, is sometimes called the Valley of the Moon. This is derived from its slightly crescent shape. Because the valley is home to a very lively music scene, the area is also cleverly called the Valley of the Tunes.
Dude, I'll be in Sonoma; we have a gig in the Valley of the Tunes this Saturday.
Normally, a naughty tune is an filthy, grim, ponging song (think something like Absolute by Mr Traumatik), but it can also be used as a joke for that reason. A very simple and/or clean song can be called a naughty tune because it’s the exact opposite
**Teddy Bear’s Picnic by Henry Hall plays**
“Naughty tune this…”