New classes of exact multistring solutions in curved spacetimes.

We find new classes of exact string solutions in a variety of curved backgrounds. They include stationary and dynamical (open, closed, straight, finitely and infinitely long) strings as well as multi-string solutions, in terms of elliptic functions. The physical properties, string length, energy and pressure are computed and analyzed. In anti de Sitter spacetime, the solutions describe an infinite number of infinitely long stationary strings of equal energy but different pressures. In de Sitter spacetime, outside the horizon, they describe infinitely many dynamical strings infalling non-radially, scattering at the horizon and going back to spatial infinity in different directions. For special values of the constants of motion, there are families of solutions with selected finite numbers of different and independent strings. In black hole spacetimes (without cosmological constant), no multi-string solutions are found. In the Schwarzschild black hole, inside the horizon, we find one straight string infalling non-radially, with indefinetely growing size, into the r = 0 singularity. In the 2+1 black hole anti de Sitter background, the string stops at r = 0 with finite length.