Most Singers will specialize in a specific style of music, such as Pop, Jazz, Rock, Musical Theater, or Opera. Some Singers cover many styles, or work in the studio singing jingles (music for advertising). Other Singers specialize in singing background parts, which is actually more difficult than singing lead, since they must be able to blend their voice in a group of Singers. The most successful Singers enjoy huge popularity with audiences, touring the world, working with prestigious musicians, Producers, and orchestras, and winning accolades, recognition, and awards such as a GRAMMY. They are also among the highest-paid musicians in the industry.