"The Hammer" is a nickname for the Hammond B3 organ, a popular electric organ known for its rich, warm sound. Developed in the 1930s, it became a staple in various music genres, especially jazz, blues, and rock. The instrument features a unique tonewheel system that produces its distinctive sound, making it a favorite among musicians. The Hammond B3 is often played with a rotating speaker called a Leslie speaker, which adds a swirling effect to the sound. Its versatility and expressive capabilities have made it a key instrument in many iconic recordings and live performances, solidifying its place in music history.