  We can construct a 4-manifold by attaching 2-handles to a 4-ball with framing
r along the components of a link in the boundary of the 4-ball. We define a
link as r-shake slice if there exists embedded spheres that represent the
generators of the second homology of the 4-manifold. This naturally extends
r-shake slice, a generalization of slice that has previously only been studied
for knots, to links of more than one component. We also define a relative
notion of shake r-concordance for links and versions with stricter conditions
on the embedded spheres that we call strongly r-shake slice and strongly r
shake concordance. We provide infinite families of links that distinguish
concordance, shake concordance, and strong shake concordance. Moreover, for r=0
we completely characterize shake slice and shake concordant links in terms of
concordance and string link infection. This characterization allows us to prove
that the first non-vanishing Milnor mu bar invariants are invariants of shake
concordance. We also argue that shake concordance does not imply link homotopy.
