Here's a tune that everybody should know. Frenesi is played in a variety of styles, often bossa or bolero. This is a cha-cha style. But beware, this is a Cuban cha-cha! The bass is probably not where you expect it. Cubans often move the bass notes ahead by a half beat.
The song itself is not complicated. It is a 32-bar AABA. The main tune is in Ab concert. The bridge is up a major third to C.