feat: expose album, song and artist annotations in the RESTful API

utils/strings.go

@@ -16,3 +16,12 @@ func NoArticle(name string) string {
 	}
 	return name
 }
+
+func StringInSlice(a string, list []string) bool {
+	for _, b := range list {
+		if b == a {
+			return true
+		}
+	}
+	return false
+}