A hymn is praise set to music and shared by a community. Singing one in a dream is read as gratitude, faith and the comfort of a familiar tune from the past.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.