1) Aped der bingle 2) Emulated Crosby 3) Emulated Perry Como 4) Sang 5) Sang like Bing 6) Sang like Bing Crosby 7) Sang like Crosby 8) Sang like Der Bingle 9) Sang like Perry Como 10) Sang sentimentally 11) Sang softly Found on https://www.crosswordclues.com/clue/crooned