Tracks A1 & B1 play @ 45 RPM. Tracks A2, B2 & B3 play @ 33 RPM. Speeds are separated by a wide gap between grooves. A1 is called C³ A2 is called C3+ B1 is called Eᵇ4 B2 is called E3⁺ B3 is called Gᵇ5-