Ganesha Pancharathna is a Stothra on Lord Ganesha By Adi Shankaracharya. Pancharathnam means five jewels. This Shlokha explains the qualities, nature of Lord Ganesha and the benefits of worshipping Him.
Ganesha Sthavam - Ajam Nirvikalpam, sanskrit devotional hymn is from the Ganesha Puranam composed by Garga Rishi. It consists of 13 stanzas out of which the first three were composed by Adi Shankaracharya. This manthra is usually chanted during puja on Shankathara Chathurthi.