The SCOTUS does not allow cameras into their courtroom. Beginning in 1955, the SCOTUS recorded oral arguments. These recordings where not made available to the public until the beginning of the next term.
Starting with the 2010 term, the SCOTUS released oral argument audio at the end of the week along with transcripts that could be used to follow along and tell who is talking. In May 2020, the SCOTUS began livestreaming oral arguments as audio online streams.
Without visual or transcripts is can be hard to tell who is speaking without first learning the voices of each justices. SCOTUS-Toons and C-Span (select cases only) offer visual aids to help views.
This tool can be used to help you learn to differentiate the current SCOTUS justice's voices. Click the start button to begin. Audio from a justice will begin to play. Click on the justice that is speaking. If you pick correctly a new audio clip will play, there are 10 rounds per game. The faster you pick correctly the more points you will score.