SONG's key strengths are the ability to make detailed or long-term studies of individuals stars. In the era of high-precision and high-cadence space photometry from the likes of Kepler, TESS, MoST, and BRITE, the capability of fully characterising individual objects relies on accurate calibrations of global photometric or asteroseismic relations. Verifying and improving sophisticated stellar models requires as full a list of observational constraints as we can gather, and high-precision space photometry combined with complementary high-resolution spectroscopic studies of individuals objects provides such information. Many objects are challenging and may require the multi-site capabilities of the SONG network. SONG can be combined with other facilities with similar capabilities to extract information that is difficult to obtain from a single site. Here I give some specific examples which can or have benefitted from multi-site campaigns involving SONG and HERCULES@ the UC Mt John Observatory in New Zealand.