A soft-toned organ stop.
"The organist pulled the dolce stop to play a gentle, sweet melody during the quiet verse of the hymn."
A surname.
"The famous Italian opera singer, Dolce, performed a stunning rendition of Puccini's final act last night."
The word dolce comes directly from Italian, where it originally meant sweet or pleasant. It entered English as a loanword to describe flavors that are sugary rather than bitter.