The BBC employed its own house bands and orchestras and it also engaged outside bands to record exclusive tracks for its programmes in BBC studios. This was the reason why Peel was able to use "session men" in his own programmes. Sessions were usually four tracks recorded and mixed in a single day; as such they often had a rough and ready, demo-like feel, somewhere between a live performance and a finished recording. During the 37 years Peel remained on BBC Radio 1, over 4000 sessions were recorded by over 2000 artists. Many classic Peel Sessions have been released on record, particularly by the Strange Fruit label.