An examination of two unique invitatory antiphons (Laudabilem virum. Adaperiat Dominus cor) in the autumn per annum office reveals a special set of mode 2 invitatories. which also adapt proper (scriptural) texts. These appear as geographically scattered instances in various medieval rites. https://www.roneverhart.com/ESP-LTD-SD-2-Sammy-Duet-Signature-Model-Electric-Guitar-Black-p20045/