\version "2.19.39"
% 
spanners = {
    s2*7 | 
    s4
        \override TextSpanner.bound-details.left.text = "(poco accel."
        \override TextSpanner.bound-details.right.text = "poco rit.)"
        % \override TextSpanner.bound-details.right.padding = #0
        % Need padding to keep at the same vertical position:
        \override TextSpanner.bound-details.right.padding = #6
        <>\startTextSpan s4 |
    s2 |
    s4. <>\stopTextSpan s8 |
    s4 <>^\markup{a tempo} s4 |
}

notes = \relative c'' {
    \time 2/4
    \repeat unfold 8 { a4 a4 }
    R2*7
    r4 a~ |
    \repeat unfold 6 a2~ |
    a |
}

\layout {
    \context {
        \Score {
            \compressFullBarRests

            \override TextSpanner.bound-details.left.padding = #0
            \override TextSpanner.bound-details.left-broken.text = ##f
            \override TextSpanner.bound-details.right-broken.text = ##f
        }
    }
}


\score {
    <<
        \new Staff <<
            \spanners
            \notes
            % { s2*9 \break }
        >>
    >>
}