In the United States, for example, the sound of the best-known crooners of the 1940s (e.g. Bing Crosby and later Elvis Presley) had utilized the ultra-smooth, rolled-off tone of RCA ribbon microphones; on the other hand, pop recordings in the 1950s (e.g. Frank Sinatra and later The Beatles) were sharper, clearer, and more present as the result of using condenser microphones with elevated upper-mid-range response such as the U 47. The U 47, which was distributed worldwide under the Telefunken brand name, was also used for some early classical orchestral recordings in stereo.