Sentence:  "When the Saints Go Marchin' In," and "Jesus Loves Me," Arly in Spanish, me in English, as, in her orange robe in the wheelchair, her paralyzed arm belted with white Velcro into its fiberglass brace, Mom "<WSD>la-la-ed</WSD>" along. 
Meaning of the word marked with <WSD> tags:  To sing or recite the syllable "la" repeatedly. (Since the 20th century)