Play[Sin[2  Pi 440 t], {t, 0, 1}]

Play[Sin[700 t + 25 t Sin[350 t]], {t, 0, 4}]

Play[Sin[2*Pi*440*t], {t, 0, 4}]

Play[
      Sin[2*Pi*440*t] + 1/10*Sin[2*Pi*(440 + 1)*t], {t, 0, 4}]