leeneia,

I believe that Trinidadians and other West Indians call these instruments "pan". But in the USA most people call them "steel drums".

For those who don't know what the heck we're talking about here's an excerpt from Steel Drums

"The Steel Drum, or Pan, is a unique instrument, and one of the most recently invented. It is a skillfully hammered 55-gallon oil drum which has been carefully tuned to produce tones. The Steel Drum carries the full chromatic range of notes, and can produce just about any type of music you can think of!

Brief History of the Origins of Pan
During British Colonial rule of Trinidad in the 1800's, hand drums were used as a call for neighbourhood gangs to collect and 'mash up' with the other gangs. Hoping to curb the violence, the government outlawed hand drums in 1886.

Deprived of the drums, the Trinidadians turned to the 'Bamboo Tamboo', where each member of the group would carry a length of bamboo and pound it on the ground as the group walked through the streets, producing distinctive rhythmic 'signatures' which identified each gang. (The word "Tamboo" is from the French "tambeau", or "drum".) When two gangs met on a march, they would pull out the machetes they had hidden inside the long bamboo poles, which solved none of the violence problems.

Soon, the government outlawed the bamboo bands as well. Deprived of all traditional rhythmic instruments, the Trinis took any objects they could find, including garbage can lids, old car parts, and empty oil barrels (from the Navy bases on the island). They used these instruments to form the Iron Bands, which marched down the streets playing the same distinctive rhythms. These impromptu parades were called Iron Band.

Somebody discovered that a dented section of barrel head produced a tone. Winston "Spree" Simon is generally credited with being the first person to put a note on a steel drum. Originally the pans were convex, like a dome rather than a dish. Ellie Manette, a pan-maker still active in the US today, was the first to dish out a pan and give the steel drum its mature form. Many tuners began experimenting with and producing tuned 'pans', eventually forming large groups of the neighborhood panmen into orchestrated bands..."

-snip-

Click that link for more info.