A "Jam Session" is an informal gathering of musicians who come together to play music without a predetermined plan or setlist. These sessions often encourage improvisation, allowing musicians to express their creativity and collaborate spontaneously. Participants can include various instrumentalists and vocalists, and the atmosphere is typically relaxed and open. Jam sessions are common in genres like jazz, blues, and rock, where musicians can showcase their skills and experiment with new ideas. They often take place in clubs, studios, or private homes, fostering a sense of community and shared musical exploration among artists.