Never heard of 'em. Any chance they were from the mid-Atlantic Area? Bethlehem Steel was (still is?) a big steel producer around here. Sounds like they may have borrowed the name.
edit: Isn't this your brother's band?
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Hand on heart...a promise, a word, and a voice
Hand on heart...a rhythm of hope, and a vision of choice
Hand on heart...promising I'll never go
I promise...hand on heart