Stoneground
... that rock band Stoneground featured seven lead singers on their 1971 debut album?
... that <a href="./Rock_music" id="mwFwA" rel="mw:WikiLink" title="Rock music">rock</a> band <b id="mwFwE"><a href="./Stoneground" id="mwFwI" rel="mw:WikiLink" title="Stoneground">Stoneground</a></b> featured seven <a href="./Lead_vocalist" id="mwFwM" rel="mw:WikiLink" title="Lead vocalist">lead singers</a> on their 1971 debut album?