How is soundcloud player programmed?

Question

This may be too broad a question, but how is soundcloud actually programmed?

To be more specific,

1. What language was used to program it?

Answer 1

I am copying the following info posted by David Noël somewhere else in 2010.

Web tier: Varnish, nginx, haproxy, thin

Data Management: Cassandra, MongoDB, mySQL master/slave cluster, memcached

Web framework: Ruby on Rails

CDN: Akamai and Edgecast

Transcoding/storage: AWS EC2/S3