Guru Paduka Stotram
Written by Adi Shankara, this stotram glorifies the sandals of the Guru. He didn't feel worthy of even writing about his Guru's feet, so he composed this stotram to worship his Guru's footwear.
Chinmaya Mission also has the text in Devanagari and IAST, with an English translation.
VedicFeed has the lyrics along with a video of a beautiful rendition: https://vedicfeed.com/guru-paduka-stotram/
How to chant correctly: plugin:youtube
Learn the first three stanzas: plugin:youtube
The middle three stanzas: plugin:youtube
The final three stanzas: plugin:youtube
You can find the chord progression on chordu.com. It's in C#m. The chords are: C# C#m D#m G#m D# G# B F# E.
Alternatively, another version has: G# C#m F# A D#m B G#m A#m.
Mantras dedicated to the Guru
गुरौ न प्राप्यते यत्तन्नान्यत्रापि हि लभ्यते।
गुरुप्रसादात सर्वं तु प्राप्नोत्येव न संशयः॥
gurau na prāpyate yattannānyatrāpi hi labhyate।
guruprasādāta sarvaṃ tu prāpnotyeva na saṃśayaḥ॥
Whatever is not obtained from the Guru, cannot be obtained from elsewhere.
With the grace of the Guru one indeed gets everything.
Source: SkandaPurana V. K. Karti. Ma. 2.7-8
Thanks to resanskrit.com. They have some great posters.
There are also a number of slokas about Guru at prokerala.
There's a PDF of the Stotram with devanagari and IAST, along with an English translation. http://www.chinmayahouston.org/pdfs/gurustotram.pdf
You can find an English transliteration and English translation of the Guru Stotram on this TimesNowNews page
And here's a video with Latin-ized text and an English translation. It's sung slowly and clearly.