A revival of interest in Jewish music was sparked as part of Hasidism. Different Hasidic groups have their own nigunim, often composed by their "rebbe" or leader. Hasidim gather around holidays to sing in groups. There are also nigunim for individual meditation, called "devekus" or "devekut" (connecting with God) nigunim. These are usually much slower than around-the-table nigunim, and are almost always sung without lyrics. The Baal Shem Tov, founder of Hasidism, spoke of "devekus nigunim" as "songs that transcend syllables and sound." Several tunes attributed to him are still used today.