This week’s fill-in for our usual and excellent podcast “Trove Thusday” is another show from the archives of “Unnatural Acts of Opera,” one intriguingly entitled “Grace Bumbry Sings Richard Strauss.” 

If any of you out there among the cher public have a favorite episode of “Unnatural Acts” that you think would bear repeating, La Cieca is. as always open to your suggestions.