Sound[Table[{
Play[Sin[440 2Pi t],{t,0,2}],
Play[Sin[440.5 2Pi t],{t,0,2}]
}, {10}]
]

Sound[Table[{
Play[Sin[440 2Pi t],{t,0,1}],
Play[Sin[660 2Pi t],{t,0,1}]
}, {10}]
]

Play[Sin[440 2Pi t]+Sin[881 2Pi t], {t,0,5}]

Play[Sin[440 2Pi t]+Sin[660 2Pi t], {t,0,5}]

If[(a=RandomReal[])<.5,
Sound[Table[{
Play[Sin[440 2Pi t],{t,0,1}],
Play[Sin[440.5 2Pi t],{t,0,1}]
}, {10}]],
Sound[Table[{
Play[Sin[440 2Pi t],{t,0,1}],
Play[Sin[440 2Pi t],{t,0,1}]
}, {10}]]
]

a