The Oyez website makes available both audio recordings and transcripts of Supreme Court oral arguments. The site currently contains recordings of oral arguments for most of the cases decided by the Court beginning with the 1968 term, as well as those for some of the leading cases decided before then. (Recordings of the announcements of the Court opinions are also available selectively on this website.) Recordings can be accessed through streaming audio, and the files are available in MP3 format. Transcripts of oral arguments are also available on this site for all cases argued since 1980 as well as for selected cases argued before then.
Both recordings and transcripts can be accessed from the Oyez-Cases page (shown below). From this page, you can select the Court term in which you are interested and then choose the case from the list provided in the center of the screen.
When you click on the link for a specific case, you will retrieve a page with basic information about the case as well as links to the oral arguments and/or opinion announcements if available. Keep in mind that there is a lag between the time arguments are heard and when they are available on this site.
You can also sometimes access arguments on the Oyez site through other websites that provide links to Oyez. For example, if you go to Cornell University Law School’s Legal Information Institute website and go to their page on the U.S. Supreme Court, you will see a link for “Oral argument recordings” on the bottom of the page under “Other Resources.” When you click on this link, it will take you to the Oyez site.