Thanks for answers, friends!
I don't have ruby installed, so I try Mojca solution.
It works perfectly (thanks!), except I need to wrap the lyrics into the
'lines' envinroment. To achieve this, I need to replace \setupwhitespace
with \setupinterlinespace and adjust raisebox amount.
\starttext
\def\Ch#1{%
\strut\hbox to 0pt{\raisebox{0.45\baselineskip}\hbox{\bf#1}\hss}}
\setupinterlinespace[big]
\startlines
\Ch{E}Cvet dišeč z \Ch{H7}jutrom se od\Ch{cis}pre,
\Ch{A}sonce od\Ch{E}pira o\Ch{H}či.
\Ch{E}Polje z vetrom v \Ch{H7}plesu ziblje \Ch{cis}se.
Gos\Ch{E}pod, pov\Ch{H}sod vidim \Ch{E}Te.
\stoplines
\stoptext
What do you mean talking about optimization? )
Regards,
Vyatcheslav
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