Must be the Sax every time... no other woodwind instrument can touch it for dynamic range... sometimes silky soft & soulful... other times raucous & earsplitting...
Versatile too cos there's 4 types... most of which you'll never hear on dance records... For anyone interested, here's where you can hear breaks by each type...
Soprano - (as murdered by Kenny G) or played properly on "Will You Just Politely Say Goodnight" by Hazel O'Connor
Alto - "Baker Street" by Gerry Rafferty (sax break was played by God... Raphael Ravenscroft)
Tenor - Heard all over the place... uh... "One Step Beyond" by Madness
Baritone - as made famous by Gerry Mulligan (known only to the jazzers I suspect)... uh... the famous farty low note at the end of the muppets theme... that was a bari...
The ultimate sax break has gotta be "Hit Me with Your Rhythm Stick" by Ian Dury & The Blockheads... Davey Payne does a solo playing 2 saxes at the same time...