Someone at Wikipedia wrote the theme was sang by Heart………..

[fgadmin]

Archived from the IMDb Discussion Forums — Thundercats

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BanzaiTron — 9 years ago(October 05, 2016 12:43 AM)

yup the same band that did 'Barracuda'. Is this even bloody true? Its awesome if they did, but I don't think is true.
This will be the only comment or reply you'll get. Like I give a sh!t about YOUR interwebz opinion.

[fgadmin]

Fluke_Skywalker — 9 years ago(October 13, 2016 06:41 AM)

If it's on Wikipedia it must be true except this time. The theme was written by Bernard Hoffer. Not sure who the vocalist(s) is/are, but it ain't Heart.

[fgadmin]

booshman — 9 years ago(January 28, 2017 06:35 AM)

It was not sung by Heart. The Hear the Roar guide book states it was a session singer.