 The introduction generally starts in major because marches typically are in major keys, but there are marches with introductions in minor keys, including "Gladiator", "The Picadore", "Nobles of the Mystic Shrine", and "Rolling Thunder".The next section is commonly called the "first strain", as it is the first prominent melody of the march.The first strain is typically 8 or 16 bars long with 4-measure phrases.