BBC Radio 1
The daytime shows (Monday-Thursday 4.00 - 19.00, Friday 4.00 - 18.00, Saturday 6.00 - 16.00 and Sunday 6.00 - 19.00) are very speech-focused and use an extensive playlist to introduce unknown and emerging material alongside more established, top 40 hits from the recent past (usually in a 5-year cycle).