DG and AD refer to different periods in the music world. DG is the abbreviation of Deutsche Grammophon, which means German Gold Record Company. It is a title suitable for vinyl record era. And AD refers to Anno Domini, which means AD. Specifically, AD is usually used to indicate that the recording time is after the birth of Christ, while DG is usually used for records before the middle of the 2th century.

Although DG and AD are aimed at different periods of music, they both have unique charm. DG's vinyl records are full of nostalgia, and the sound quality is warmer and more romantic. On the other hand, the digital records of AD have clearer timbre and wider range, which is suitable for interpreting more complicated music. Both styles of music have become world-class classics.

Both DG and AD represent the evolution and change of music. The development of science and technology makes the recording technology of records more and more mature. From vinyl records to magnetic tapes to digital records, each generation of music has its own unique style and characteristics. Therefore, DG and AD can be regarded as milestones in the history of music, which witnessed the growth and development of the music industry.