sound loudly and sonorously 大きく朗々と鳴り響く - 日本語WordNet
Ignatius Gallaher slapped his friend sonorously on the back.
イグネイシャス・ガラハーは友の背にピシャリと音を響かせた。 - James Joyce『小さな雲』
the congregation consisted chiefly of a few young folk, who snored sonorously その集会は、主に数人の若い人で成り立っていたが、彼らは、響き渡るほど大きないびきをかいていた - 日本語WordNet
Benkei takes up a scroll he had with him by chance, and, pretending it is a real kanjincho, he "reads" it aloud sonorously (the Scene of Reading Kanjincho Aloud).
弁慶はたまたま持っていた巻物を勧進帳であるかのように装い、朗々と読み上げる(勧進帳読上げ)。 - Wikipedia日英京都関連文書対訳コーパス
When someone talks as if he or she is reading a script, but in fact is improvising his or her speech, the expression 'kanjincho' is used, which is derived from the Scene of Reading Kanjincho Aloud, where Benkei pretends to read the scroll he happened to have with him aloud and sonorously.
弁慶が「読み上げ」で持ち合わせの巻物を朗々と読み上げる場面の連想から、あたかも原稿を読んでいるようで実は即興でものを言っているさまを、「勧進帳」という。 - Wikipedia日英京都関連文書対訳コーパス