Everything works well and good structure.

Sources/MusicBrainz/Models/ReleaseGroup.swift

@@ -0,0 +1,19 @@
+import Foundation
+
+public struct ReleaseGroup: MusicBrainzSearchable {
+	public static let entityType: MusicBrainzEntity = .releaseGroup
+
+	public let id: String
+	public let title: String
+	public let primaryType: String?
+	public let artistCredit: [ArtistCredit]?
+	public let disambiguation: String?
+	public let relations: [Relation]?
+	public let score: Int?
+
+	enum CodingKeys: String, CodingKey {
+		case id, title, disambiguation, score, relations
+		case primaryType = "primary-type"
+		case artistCredit = "artist-credit"
+	}
+}