diff --git a/Sources/music-notation/Instrument.swift b/Sources/music-notation/Instrument.swift
index 370f1ea..3a841ef 100644
--- a/Sources/music-notation/Instrument.swift
+++ b/Sources/music-notation/Instrument.swift
@@ -7,11 +7,23 @@
 //
 
 public struct Instrument {
-	public let name: String = ""
+	public let name: String
 
-	public let lineCount: Int = 0
+	public let lineCount: Int
 
 	/// Number of steps that this instrument is transposed.
-	public let chromaticTransposition: Int = 0
-	public let octaveTransposition: Int = 0
+	public let chromaticTransposition: Int
+	public let octaveTransposition: Int
+
+	public init(
+		name: String = "",
+		lineCount: Int = 0,
+		chromaticTransposition: Int = 0,
+		octaveTransposition: Int = 0
+	) {
+		self.name = name
+		self.lineCount = lineCount
+		self.chromaticTransposition = chromaticTransposition
+		self.octaveTransposition = octaveTransposition
+	}
 }