DJ Steve Lamacq is to join BBC Radio 2 for a weekly show introducing audiences to new music and emerging acts.
Lamacq hosts an afternoon show on digital station 6 Music
His show is part of an overhaul of the station's evening schedule prompted by jazz presenter Humphrey Lyttleton, who has decided to cut back his workload.
Mark Radcliffe will gain Stuart Maconie as a co-presenter as his late night show moves to a 2000 timeslot.
Nick Barraclough's weekly country music show is a casualty of the new schedule, which comes into effect on 16 April.
The presenter will continue to front a series of exclusive specials featuring some of the biggest names on the country scene.
"Country music remains high on the network's agenda - with Bob Harris's regular country show complemented by Nick Barraclough's new specials," said Radio 2 controller Lesley Douglas.
Several programmes move around the schedule, with Mike Harding's Folk show and Paul Jones' Rhythm and Blues show securing an earlier time of 1900.
Humphrey Lyttleton, who has presented The Best Of Jazz for almost 40 years, has taken the decision to scale back the programme.
He will now make 26 editions a year, with pianist Jools Holland taking up the reins for a further 26 weeks.
"If this announcement has summoned the word retirement to your minds, dismiss it at once," said Lyttleton.
"I now want to have a bit more time for other things - my own band high among them."
The 85-year-old presenter will continue to chair Radio 4's comedy show I'm Sorry I Haven't A Clue.
As well as his new Radio 2 slot, Steve Lamacq keeps his shows on Radio 1 and 6 Music.