  We study the Klein-Gordon (KG) oscillators in a spinning cosmic string
spacetime and an external magnetic field. The corresponding KG-equation is
shown to admit a solution in the form of the confluent hypergeometric
functions/polynomials. Consequently, the corresponding energies are shown to be
given in a quadratic equation of a delicate nature that has to be solved in an
orderly manner (for it involves the energies for KG-particles/antiparticles,
$E=E_{\pm}=\pm\left\vert E\right\vert $ along with the magnetic quantum number
$m=m_{\pm }=\pm |m|$). Following a case-by-case strategy allowed us to clearly
observe the effects of the spinning cosmic string on the spectroscopic
structure of the KG-oscillators. We have observed that, under some parametric
settings, whilst the Landau-like energies of the KG-particles ($E=E_{+}$), with
$m=m_{+}$, have no explicit dependence on the spinning string parameter or
wedge parameter $\alpha$, the KG-antiparticles ($E=E_{-}$), with $m=m_{-}$,
have such explicit dependence. Interestingly, the co-existence of a spinning
cosmic string and external magnetic field eliminates the effect of the wedge
parameter ( a byproduct of the string) for KG-particles ($E=E_{+}$), with
$m=m_{+}$, but not for the KG-antiparticles ($E=E_{-}$), with $m=m_{-}$. Such
co-existence is observed to break the symmetry of the energies of the
KG-particles and antiparticles about $E=0$ for KG-oscillators. However, for
KG-particles ($E=E_{+}$), with $m=m_{-}$, and KG-antiparticles ($E=E_{-}$),
with $m=m_{+}$, are observed to be unfortunate for being indeterminable.
Moreover, for the spinning parameter $\beta >>1$, clustering of the energy
levels is observed eminent to indicate that there is no distinction between
energy levels at such values of $\beta $.
