The 2.37 version of SingSong Karaoke for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. SingSong Karaoke for Mac belongs to Audio & Video Tools. This Mac app was originally produced by Esoteric Software. We recommend checking the downloaded files with any free antivirus.
From the developer:
SingSong is a karaoke game for Mac OS X, Windows, and Linux. Karaoke any song in the world and SingSong will score you based on how well you sing! Key Features * Karaoke any song in the world SingSong allows you to karaoke any song you want to sing, in any language. * Support for hundreds of songs SingSong comes with support for hundreds of songs and it is easy to add support for new songs yourself.
You may want to check out more Mac applications, such as Music World - Karaoke, Karaoke One or KaraokeTube, which might be related to SingSong Karaoke.