Same as phonograph needle. Generally diamond or sapphire tipped, in a cutter head or pickup cartridge.
"The CD's of the older music took me back to a fun and carefree time of life. I enjoyed sharing the songs and stories with my children. Music can be a sort of history lesson. Because many events are marked by a song that stays in your mind. When the music is played a variety of memories return that otherwise might not have been triggered. ..."