  The one-loop dispersion equation which defines the collective excitations of
the massive Dirac particles in hot and dense quark-gluon medium is obtained in
the high temperature limit for the case $m<<T$ and solved explicitly for all
$|\q|$ when $\mu=0$. Four well-separated spectrum branches (quasi-particle and
quasi-hole excitations) are found and their behaviors for the small and large
$|\q|$ are investigated. All calculations are performed using the temperature
Green function technique and fixing the Feynman gauge. The gauge dependency of
the spectra found are briefly discussed.
