For 10 points, what is this last opera by Gioachino Rossini, perhaps best remembered for the "Gallop" section of its overture featured in The Lone Ranger?
This opera begins with a Passo a Sei, part of a marriage celebration between two unnamed shepherds.  In the aria "Asile Hereditaire", one character laments the death of his father Melcthal, that character had earlier sung the aria "Pour notre amour" upon bidding farewell to his beloved, Mathilde.  More famous may be the cello solo and flute and English horn duet in its overture, or the aria "Sois Immobile", in which the title character instructs his son Jemmy to stay still before piercing the apple atop his head.  For 10 points, what is this last opera by Gioachino Rossini, perhaps best remembered for the "Gallop" section of its overture featured in The Lone Ranger?
This opera begins with a Passo a Sei, part of a marriage celebration between two unnamed shepherds.  
{William Tell} (or {Guillaume Tell})