The biographies of troubadours were mainly recorded in scrolls, where their tales of love and romance were documented. The other options listed do not accurately reflect the primary medium of their lyrical compositions. Scrolls were the standard format used during medieval times for such poetic records. ;
The biographies of troubadours were primarily recorded in scrolls, which were the typical medium for poetic documentation during medieval times. Other forms mentioned, like biblios and stone tablets, were not commonly used for this purpose. Therefore, the correct answer is 'scrolls.'
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