Frank Zappa fans, what am I missing?

In the past six months, Frank Zappa has become my second favorite artist of all time, inching closer and closer to first. Although, I don't purchase entire CD's. And going through each and every one would take an extremely long time. So I don't have too many songs by him. Here's what I have; tell me which gems I'm missing?

Andy

Apostrophe

Black Napkins

Broken Hearts are for A**holes

Camarillo Brillo

Cocaine Decisions

The Duke of Prunes

Easy Meat

Flakes

Hot Plate Heaven at the Green Hotel

I'm the Slime

I Have Been In You

In France

Inca Roads

It Must Be a Camel

Joe's Garage

King Kong Part 1

Little Umbrellas

Muffin Man

My Guitar Wants to Kill Your Momma

Orange County Lumber Truck

Peaches en Regalia

Po-Jama People

RDNZL

San Berdino

Sinister Footwear II

Son of Mr. Green Genes

St. Alfonso's Pancake Breakfast

St. Etienne

Stinkfoot

The Gumbo Variations

The Sheik Yerbouti Tango

Watermelon in Easter Hay

Willie the P*mp

Yo Mama

Zoot Allures