Chord names above staff

[Claus Rogge]

I searched the archives but I still can´t figure it out - how do I make
the chord names appear ABOVE the staff?

Can someone please help me out, what am I doing wrong?

This is the code:

\version "2.8.0"

mel = \relative c'
{\partial2. a4 a cis | cis1 | r4 a a b | b1 r4 b4 b cis d1 r4 d4 e b
cis1 r4 cis4 cis e e1 r4 cis4 d e d1 r4 a4 a b cis1 r4 b4 b a a1
\partial4 r4}

bas = \relative c {\partial2. r4 r2 | a1 a e e \break e e a a \break a a
d d \break a e a \partial4 a4}

bgl = \chords {r2. a1 a e e e e a a a a d d a e a a4}
\paper
{
#(set-default-paper-size "a4")
}
\header
{
title="Banks of the Ohio"
}

{
<<
\bgl
\clef "treble_8" \key a \major
\override Staff.TimeSignature #'style = #'()
\mel
\\
\bas
\\
>>
}