Download of MuSA_RT 1.0 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The most popular version of the application is 1.0. The bundle id for MuSA_RT for Mac is com.arjf.musart. You can run this free app on Mac OS X 10.7 or later. The actual developer of this free software for Mac is com.arjf. The software lies within Education Tools, more precisely Teaching Tools.
From the developer:
MuSA_RT animates a visual representation of tonal patterns - pitches, chords, key - in music as it is being performed.
MuSA_RT applies music analysis algorithms rooted in Elaine Chew's Spiral Array model of tonality, which also provides the 3D geometry for the visualization space.
You may want to check out more software for Mac, such as EarMaster Essential, Planbook or Cinderella2, which might be related to MuSA_RT.