If I Were A Rich Man (song) - Grammar: "was" or "were"

Grammar: "was" or "were"

The subject is singular, yet the verb to be is conjugated as were and not was because the clause is not in the indicative mood but in the subjunctive mood. The song "Rich Girl" changes it to "If I was a rich girl", reflecting the common but incorrect "correction" of changing the "were" to "was".