Use DADGAD Tuning
The DADGAD name comes from the notes the strings are tuned to. DADGAD tuning is often referred to as a modal tuning. The DADGAD tuning is ambiguous in terms of being major or minor as it contains perfect 4ths (G), perfect 5ths (A), the root (D) but no 3rd. The open strings strummed together are basically a big Dsus4 chord. This tuning is popular among solo fingerstyle guitarists and is especially effective when playing Celtic tunes. Many acoustic guitarists of a percussive persuasion also favour this tuning. DADGAD is great for creating full sounding arrangements and otherwise tricky single-note lines.