Stream music from your mac to iPhone and use it as 3.5 output

[M0esmac]

Hi everyone,

There was one app which I can't remember name of, so it worked like that:

You launch mac app (as I can remember), then you open iPhone/iPod app, then Mac app detects it and then you can use your iPhone as a receiver (from mac) and output music from iPhone's 3.5mm to music system/speakers which have 3.5.

Any help?

Thanks!