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The Amazon.com MP3 Store has an audio clip of "Can I Get A Witness" by Marvin Gaye on the album listed below. Click on the album name and you will be taken to a list of mp3 album tracks with audio samples that include the above song.
The Complete Collection - Marvin GayeCDUniverse also has a clip of the above song on the album listed below. Click on the album name and you will be taken to a list of albums, including the one below, that include the above song. (Note: Those albums with music note icons all have song clips. To see the entire list of CDs, you may need to scroll down all the way to the bottom as many songs have lyrics and other information displayed at the top.)
Gold - Marvin Gaye