Examples are $$Y_{00}=\sqrt{\frac{1}{4\pi}},$$ for $l=m_l=0$, $$Y_{10}=\sqrt{\frac{3}{4\pi}}cos(\theta),$$ for $l=1$ and $m_l=0$, $$Y_{1\pm 1}=\sqrt{\frac{3}{8\pi}}sin(\theta)exp(\pm i\phi),$$ for $l=1$ and $m_l=\pm 1$, $$Y_{20}=\sqrt{\frac{5}{16\pi}}(3cos^2(\theta)-1)$$ for $l=2$ and $m_l=0$ etc.